American Service Providers Offering GSM Mobile Phones

There are too many GSM mobile phones offered by American service providers as follows:

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T-Mobile
T-mobile is a renowned company offering GSM technology. There are various plans offered by T-mobile so that you can chose which ever suits you the best. The latest plan by T-Mobile includes 850MHZ roaming. Through 850MHZ roaming, T-Mobile postpaid customers can access roaming service in the areas where it was not possible before. Moreover, you can also use GPRS in most of the domestic area where roaming coverage can be accessed. At the moment, this plan is not available for T-Mobile to Go plan users.
Cingular
Cingular Wireless is a well known and probably the largest cellular phone company in the US. Having more than 56 million users world wide, it offers the largest data network and digital voice. It has its headquarters in Georgia, United States and Atlanta. The main feature of their GSM service is the provision of GPRS and EDGE.
M-mode service with AT&T
AT&T, according to their revenues is considered the second largest mobile phone service providers in the US. Mmode is a wireless web service which was introduced by AT&T Wireless in 2002. Through Mmode you can get daily news, weather reports, traffic, games, and reference material yellow and white page directories. It works by the help of WAP/WML (wireless HTML protocols) which are used to deliver encoded or abbreviated web pages to the color displays of Mmode phones.
Can these Phones be Unlocked?
Yes, these phones can be unlocked. It is also dependant upon the situation. For instance if you need your phone to be unlocked because you are traveling and you don't want to pay higher roaming rates the provider will unlock your phone.

What is meant by "unlocking" your GSM Phone? Why would you want to "unlock" your Phone?

Unlocking your phone means to abandon your current network provider and get hold of someone else.

There can be various reasons due to which you are compelled to change your current network provider. Maybe you have to travel abroad and you don't want to pay higher roaming charges and instead simply opt for the sim card of the region you are going into or maybe you want to opt for a competitor's network.

Can you rent a GSM Phone Instead?

GSM rental phones came as a solution to unlocking problems while roaming or traveling. Today there are various rental companies that allow you to rent a mobile phone for your trip. In this way, you are secured from unlocking hassles or paying roaming charges.

Dual and Triple Band Phones

Tri-band phones are basically phones that can operate on any of the three internationally elected frequency bands; GSM 900 MHz, GSM 1800 MHz and GSM 1900 MHz. this is generally recommended for roaming or international usage. In the US, dual band phones are in buzz. A dual band phone s basically an international device having 900-1900 MHz for roaming in over 100 countries. Whenever this device is switched on, it tries to scan toe 1900 MHz frequency band for a US carrier, if not then it does the same for a UK carrier or an Asian.

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