The Cell Phone Mysteries – What Are Dual, Tri and Quad Band Cell Phones and Where Will They Work?

The world of the mobile phone is a confusing one these days, particularly for those wondering how to start a cell phone business. Few things are perhaps as confusing as GSM frequencies and GSM phones that seem to work in some parts of the world but not in others.

Multiple band cell phones and GSM frequencies can be especially confusing for anyone wondering how to start a cell phone business.

So what is the background behind the GSM network?

The GSM network was first suggested by a group of European technicians and policy makers in 1982 and it didn’t take long for consumers and phone makers to adopt the new network after it first emerged in 1991. It wasn’t long before there was growing GSM coverage in an increasing number of countries.

The GSM world grew quickly. There were more than one million subscribers spread over 70 carriers in 30 countries by the end of 1993.

Not only did the new GSM mobile network send and receive all of its information digitally, making it the first 2G mobile phone to be developed it also gave users a great deal of freedom on what they did with it. For the first time they were able to send short written messages to each other for a fraction of the price of a phone call, they could change their carrier and/or go to a different country without getting a new phone.

All they needed to do was to take one GSM SIM card out and replace it with another GSM card and they were in business.

But, as the unknown powers of the world decree, things shouldn’t be that easy and the GSM frequencies set by most of the GSM networks had already been assigned to other purposes by the powers that be.

So, in a situation very similar to TV watchers and people with surveillance systems, a phone that worked in Sussex England wouldn’t pick up anything in San Antonio in the US. Basically it wasn’t a case of one GSM frequency fits all.

As a result, many cell phone makers create cell phones that can work with more than one band with some working with as many as 4 bands.

Still this doesn’t mean there aren’t questions and people are often left asking:

  • What is GSM?
  • What are the GSM frequencies?
  • Why do GSM phones have more than one band?
  • Will different frequencies work in different areas?
  • How can I check if a phone will work in a particular area?
  • How are multiple band phones defined and where will they work?

We’re going to attempt to look at those questions in this article.

What is GSM? GSM, Global System for Mobile communications (or the Acronym formally known as Groupe Sp├ęcial Mobile) is a wireless transmission standard used for mobile phones and, recently wireless modems. GSM and CDMA differ because GSM networks use a SIM card to store all the necessary information to send and receive calls where with CDMA phones everything is kept on the phones.

If you are looking at how to start a cell phone business and you don’t have thousands in working capital GSM mobile phones will probably be a better option than CDMA as they won’t be attached to a particular carrier and don’t require you to be licensed to a particular provider to sell unlocked cell phones.

Another reason to select GSM over CDMA is that it will open up the potential customer base for each phone. As unlocked gsm phones can be used with any GSM networks. To date there is no such thing as an unlocked CDMA phone. When it comes to cell phone plans most providers (especially those in the states) love CDMA phones because it locks their consumers to them.

Why do GSM phones have more than one band? GSM Phones come with more than one band so that they will work in more than one country as there is more than one GSM frequency and they are not universally transmitted.

As a result, wholesale cellphone manufacturers make GSM and GPRS phones with multiple cell phone bands so that they can work in multiple countries. Most cell phones work on two, three or even four bands. Quad band phones are the most flexible as they can be used all over the world and are often called international phones as a result.

How are multiple band phones defined and where will they work? Multiple band phones are usually defined by how many GSM frequencies they can operate on and usually come in four different categories, dual band, tri band and quad band. If thinking about how to start a cell phone business it is important to remember the different type of bands as it could mean the difference between your customer getting a high performance phone that they’re happy with and can and them getting a shiny and costly paperweight.

Dual band phone works with two GSM frequencies and, depending on where the phone is made will probably work for the frequencies 900MHz and 1800MHz. These phones are usually less expensive than other types of cell phone and it can be a good way to get a cheap cell phone that will still send SMS MMS and act as a WAP cell phone.

The tri band phone runs on three frequencies and can be used in most countries. This unlocked GSM cell phone is a cheaper option than the quad band phone but safer than a dual band phone.

Quad band phones, or international phones as they are sometimes called, use four bands and can be used anywhere in the world. If you are looking to start a mobile phone business and you wonder what is an unlocked phone guaranteed to sell well and give you the least trouble with customers it will probably be this type of cellphone.

What Are The GSM Frequencies? Almost all of the world works on the frequencies 850Mhz, 900MHz, 1800MHz, 1900Mhz and in some rare circumstances 400MHz although there are some other frequencies in other locations.

Thankfully too areas where each frequencies work is fairly easy to define in the very general sense (although it always pays to check). So when you’re looking for what areas a cellular phone will work in you should be able to follow a rough guide.

So which areas use GSM 900 and 1800 MHZ signals and which areas use the GSM 850Mhz and 1900MHz frequencies can usually be broken into two groups.

If you are traveling in with your cell phone in Oceania, Africa, Europe, Asia (except for Japan and Korea), the Middle East, Brazil and the Baltic region and looking for roaming networks then mobile network coverage will be either 900MHz, 1800MHz or 900MHz and 1800MHz.

If you are looking for a GSM world phone that will work in the US or South America then you’re better sticking with a wireless cell phone that’ll work on the 850Mhz and 1900MHz bands.

Will different frequencies work in different areas? With the majority of the GSM world being broken into two main groups (those that take Most of the GSM world is roughly broken up into four main frequencies 900MHz and/or 1800MHz and 850Mhz and/or 1900MHz most unlocked GSM phones will work on one, two or three of the GSM frequencies around the world giving you some level of international roaming on an unlocked phone.

However, you possibly won’t get any joy if for example you take a dual band phone designed for Europe and Asia and then try to use that bluetooth phone in the US.

How can I check if a phone will work in a particular area? There are two ways to check if a phone will work in a particular area; the first is to get the phone band, which can usually be found on the product description.

If you’re working through how to start a cell phone business and considering phones to stock, it doesn’t matter if you’re thinking about a multimedia mobile, WAP phone or GSM watch phone, the process should be the same. If you are sourcing cell phones from a wholesale supplier or wholesale dropship vendor put the ball into their court. They should have that information on their website or product advertising material for the unlocked cell phone.

Once you’ve got the GSM frequency the GSM phone worked on you can make sure it will work in your area.

If you are looking for a cellphone for yourself this could be as easy as calling your local service provider, or looking it up on sites like GSMworld dot com or worldtimezones dot com.

If you are wondering how to start a cell phone business then your best course of action is to list the frequencies on the description for the GSM cell phone, along with the phone’s other features (like if it is a music phone or it has a good cell phone camera) and tell the person who wants to buy unlocked cell phones from you which parts of the world it will probably work in.

So it looks like cell phone bands and GSM frequencies aren’t that scary after. It’s just a case of knowing where to look and ensuring you’ve got the right phone for the right location.

Cell Phone Recon Product Review – Monitor Child’s Cell Phone Activity

Cell Phone Recon Product Review

Product Overview:

Cell Phone Recon is software that gives you the ability to secretly monitor your cell phone. The software logs all of your incoming and outgoing text messages, call history, and emails. The software will also allow you to track your phone location via GPS, so if you lose your phone, or just want to check its location, you can easily find it. Perfect for monitoring your child’s phone, or even your spouse’s phone. Use to investigate suspicious behavior, or to get peace of mind.

The software is installed in “stealth mode” and runs completely hidden in the background, meaning that there are no traces of the monitoring software on your phone.

To view the logged information, simply log into the administration panel via any internet browser, and every text message, email, and ingoing/outgoing phone number will be listed. In addition, the exact street address will be listed next to each text message, phone call, or email, letting you know exactly where the phone was when any of those activities were logged.

For example, if your child text messages or calls you and says they are staying late at school to study, you can check to make sure they are really where they say they are.

Installation and Setup:

Installation is straightforward and simple. Cell Phone Recon comes with an installation web address and license key. Go to the web address on the mobile browser on your cell phone, enter the provided license key, and the phone will install the Cell Phone Recon software. Installation takes just a couple minutes, and when complete, the Cell Phone Recon software will be actively tracking and monitoring the activity on your chid’s cell phone.


While the software is operating on your phone, you won’t see any notifications, windows, or indications that that all of your text messages, emails, calls, and GPS location is being monitored. This is for both ease of use and stealth operation. Phone activity is invisibly transmitted via your phone’s data connection.

Each product license can be installed only on one phone at a time, so if you get a new phone, or need to monitor a different phone, just uninstall the software, and re-install it on a new phone.

Viewing Phone History and GPS Location:

Reviewing call logs, emails, text messages, and logged GPS data from your phone is also straightforward. Log in to your administration panel on any internet browser with your username and password, and all of the data is presented to you in an easy to read table format. You can even sort the table by date, time, address, or phone number.

You can also export the logged phone data to a CSV file (used by Microsoft Excel and other spreadsheet programs) for a quick and easy backup of all your phone usage history.

The GPS tracking feature has another convenient purpose – it records the location of where the phone is at when a particular logged action took place. So if you call your child, and they tell you they are staying late after school, you can verify this by looking at the location on a map. You can also see where the phone was when it sent or received a text message or email.


Cell Phone Recon is compatible with most major smartphone brands – Blackberry, Android, Windows Mobile, and Symbian OS. It has been tested to work with T-Mobile, Sprint, Verizon, AT&T, and many other US carriers. The one major smartphone that the Cell Phone Recon is not yet compatible with is the Apple iPhone, due to the fact that all programs that run on the iPhone must be approved and sold through Apple’s App Store. If you are looking to monitor an iPhone, you would need a product such as the iPhone Recovery iSpy Stick.


  • Stealth operation for covert monitoring
  • Monitors and records all ingoing/outgoing emails, call history, text messages, and emails
  • View logged information from any internet browser
  • View GPS location of phone on Google Maps
  • Works on almost all major cell phone brands and service providers
  • One-time license fee gets you 5 years of unlimited monitoring


  • Unable to work on Apple iPhone


Overall, the Cell Phone Recon offers a very comprehensive set of cell phone monitoring features. With the ability to log every incoming and outgoing text message, email, detailed call history, and GPS location, this product is a very useful piece of monitoring software for smartphone owners.

Legal Disclaimer:

Cell Phone Recon can only be used to monitor phones that you own, for example, your child or spouse’s cell phone that you pay for. Using this software on a phone that is NOT yours may be illegal. Check all applicable state, local, and federal laws before using this product if you are unsure whether or not your intended use is legal.

Traveling in Italy and Using Your Cell Phone

You do need a cell phone when you visit Italy. Italy is a GSM country and the networks operate on 900 MHz and 1800 MHz bandwidth, where you will need a GSM handset to make and receive calls. You could take your US cell phone on roaming to Italy through your home service provider, but the outgoing and incoming calls are not cheap and you are bound to run up an outrageous monthly bill. The best way is to rent Italy cell phone from and pay a low weekly or monthly rate at a fraction of cost to any other, renting out such phones. Italy cell phone rentals from are not only affordable but provide you with the advantage of the cheapest of all rates available, and make your money take you further in your trip to Italy. The rates offered by are just fractions of what it would cost you to rent Italy cell phone through conventional sources or roam with your own US cell phone through your home service provider.

To take full advantage of a comprehensive cost saving, a pre-paid Italy SIM card along with your rented Italy cell phone could save you over 80% of your call expenses. When you purchase a pre-paid Italy SIM card, you get a local cell phone number, and all your outgoing calls are charged at local rates. The calls that you receive are all FREE of any charge, no matter where they generate from. Compare this to the fact that when you take your US cell phone on roaming to Italy, you will not only pay for your outgoing call but also for your incoming calls. Since your US cell phone is on roaming through your home service provider, a business agreement has been entered into between your home service provider and the Italian network that you are using while on roaming in Italy. Through this agreement the Italian network provides a US cell phone user. like you, the necessary mobile services and each time you make or receive a call, your home service provider is charged for such service. Not only is that, with you being on roaming, there other charges that your home service provider has to pay to the Italian network provider. This is the reason why you have to pay high charges for your outgoing and incoming calls when you are roaming with your US phone in Italy.

When you rent Italy cell phone, you do not have to pay any roaming charges and with a pre-paid Italy SIM card, you pay for the calls that you make as the locals do and all your incoming calls are absolutely free. At a glance you can appreciate the savings that you have, with Italy cell phone rentals and pre-paid Italy SIM card, which can run up to more than 80% of your communication expenses which you would spend otherwise.

When you purchase a pre-paid Italy SIM card, you get an initial talk time credit. This helps you to use your Italy cell phone right away as soon as you reach Italy. For topping up your talk time credit, you can purchase a recharge voucher, which is available in any of the convenience stores in Italy. You get a choice of values for the amount of credit that you would want. These recharge vouchers are available in many denominations and you have the option to purchase the right amount of credit. You need simply to scratch off the hidden PIN in that voucher and then key in that number to have your credit topped up.

Your pre-paid SIM card for Italy is a small printed circuit board, a little smaller than a postage stamp. It goes into a slot at the back of your rented Italy cell phone and forma the main intelligent module, letting you make and receive calls. SIM stands for Subscriber Identity Module, which has an embedded microprocessor with memories. Your pre-paid SIM card holds your unique information, such as, your phone number, your service plan details, the International Mobile Subscriber Identity (IMSI) of your cell phone SIM card, and more security related details, which are transmitted to the nearest tower as soon as you switch on your Italy cell phone. This information is then matched with the database of the network that you are visiting in Italy. On matching the details, your cell phone is ready to make and receive calls.

Your pre-paid Italy SIM card also has an address book, which holds the name and numbers of the people you call frequently. The SIM card also logs your outgoing and incoming calls, including the ones which you fail to respond. These are all logged along with the relevant time and date of the calls made or received.

The number of mobile subscriptions in Italy has surpassed landline installations. As a result, the network coverage is one of the best in the world, where you will not have any ‘dropped calls’ or have difficult to connect. With your pre-paid Italy SIM card your calls will not be hopping from network to network, since you will be calling through one of the Italian networks. When you but a pre-paid Italy SIM card, you pre-pay for your calls and nothing more is charged to you. With all your incoming calls being FREE and your outgoing calls being charged at local rates, your savings, compared to any other option, are very high. You do not pay for roaming charges and you do not receive any bill at the end of the month. There is no contract for you to sign.

If you wish to take your US phone to Italy, there are three considerations to be made. One is that your cell phone needs to be GSM. Two, even if you have a GSM US cell phone it is unlikely that it will work in Italy. Networks in North America. Canada and a few other neighbouring countries work on different GSM frequency bands than that of the Italian networks. US GSM networks operate on 850 MHz and 1900 MHz frequency bands while Italy operates on 900 MHz and 1800 MHz bands. Unless you have a multi-frequency handset, could be a quad band or tri-band cell GSM phone, you will need a compatible cell phone for your trip to Italy. Italy cell phone rentals from are all Italy network compatible and provides you the cheapest solution for your right cell phone in Italy. Third, if you plan to take your US cell phone and carry your number on roaming to Italy through your home service provider, you will need to pay high roaming charges for your outgoing and incoming calls.

You are now already convinced about the fact that Italy cell phone rentals with pre-paid Italy SIM card can save you unbelievable amounts with respect to your communication expenses. When you rent Italy cell phone and purchase a pre-paid Italy SIM card from you get a full 24 hour support for the package, for 7 days a week, 365 days a year. What better could be the deal with offering Italy cell phone rental at a fraction of a cost than what others offer and a pre-paid Italy SIM card, providing you with an individual saving of up to 80% of your communication costs. You do not pay anything else and since you pre-pay your call charges, you are in absolute control of your expenses.

If you are visiting Italy for the first time, you would perhaps like to know about the country. Italy is a bit larger than the Arizona. It is a long peninsula, shaping like a boat. To its west it has the Tyrrhenian Sea and on the east the Adriatic. The country is encircled by France, Switzerland, Austria, and Slovenia to the north. While the Apennine Mountains forms the backbone of the country, the Alps form the northern border. Italy is a country of beautiful lakes and the largest one is Garda, with Po being its principle river flowing from the Alps, lining the country’s western border and the river crosses Lombard plain to the Adriatic Sea. There are lots of islands which form a part of Italy, the largest being Sicily.
When you are in Italy you will be visiting, Florence, Venice, Rome and the other attractions in the country. You will be taking the Gondola down the Grand Canal, planning to visit one of the finest restaurants in Venice for a delicious Italian preparation. You would perhaps think of watching a show before that. In Rome you will visit the great Colosseum and its mammoth size will make you wonder of the ancient display of strength that went on inside, watched by 50,000 spectators around a central elliptical arena.. It is an amphitheatre, and when you stand in the middle of that great arena, you can almost hear the cheer of that crowd. You would need Italy cell phone to book your seats at the theatre and for table reservations in the restaurant that you want to have your dinner.

Where-ever you are in Italy, you cannot be without your cell phone. You have to be in touch with your associates, friends and family back home and need to be available to those who want to get in touch with you, 24 hours a day, 7 days a week. You need to have a cell phone which is compatible to Italy network conditions with a calling plan which will provide you with a maximum monitory savings. What more could you expect when you go for Italy cell phone rental and a pre-paid Italy SIM card from providing you with optimum savings on your outgoing calls, charged at local rates.

Networks in Italy operate on Global System for Mobile Communications (GSM) technology and all Italy SIM cards are compatible with GSM frequency bands. The cell phone that you are taking to Italy needs to be GSM compatible, operating on the Italian network frequencies. GSM is the second (2G) generation mobile telephony technology and is the first digital system. It replaces the old first generation (1G) analog technology. GSM is used over more than 214 countries and has more than 80% of subscribers out of the total number of mobile users in the world. GSM has a set of four frequency bands, 850 MHz, 900 MHz, 1800 MHz and 1900 MHz, which are distributed to the different regions in the world. The GSM frequency bands used by the networks in Northern America, Canada and few other countries in the Americas are quite exclusive to the rest of the world and this sets US apart from the rest of the world regions. It is for this reason that US GSM cell phones are unlikely to work in Italy, unless the cell phone is a multi-frequency handset.
For convenience of travellers, cell phones now come with the features to respond to multiple bandwidths. The quad band phone responds to all the GSM frequencies and can be taken to any part of the world. The tri-band covers three of the four GSM frequency bandwidths, which are 800MHz, 900MHz and 1800MHz. The dual band on the other hand operates on just two frequency bands – 800MHz and 1900MHz.

Your GSM cell phone must be SIM unlocked before any SIM card can be used with it. SIM locked cell phones can only operate with the SIM card that it is meant for and therefore, your handset has to be SIM unlocked for you to use the pre-paid Italy SIM card. When you enter into a contact with your service provider, there may be a clause that might stipulate that you need to be in service with the provider for a specific period of time. In exchange, the service provider offers a cell phone, absolutely free of any cost and this phone is necessarily SIM locked. This is done to ensure that you use the SIM card that you received from the service provider and none else. At the end of the contract period, your cell phone becomes your property and your service provider assists you to SIM unlock your phone. It is then that you may opt for any other SIM card that you may like to use.

Whether you are taking your own US GSM cell phone, buying one or renting, it is imperative that the cell phone that you are taking with you to Italy is SIM unlocked. All Italy cell phone rentals from are not only SIM unlocked but are also compatible with the network frequency bands in Italy.