GMS stands for Global System for Mobile Communications. It just means that it's a system for cell phone service in different parts of the world. All mobile phones have a GSM system of some sort in order to be functional.
No it is not even a GSM phone, it is an iDEN phone, See the link below.
If you mean a Motorola RAZR phone locked to Metropcs, then it's not possible. AT&T runs on a GSM carrier, while Metropcs runs on a different technology, which is not compatible with GSM. So even if the phone is flashed, it would still not work on AT&T.
a phone with these two facility can work in GSM with sim card and can work without sim card in cdma mode
Unlocked phones are GSM phones that will work with any GSM carrier. A GSM phone works on AT& T, T-mobil and any other system that is GSM compatible. Most inetrnational cariers are GSM.
Buying unlocked gsm phone is very legal. You can even figure out how to unlock them yourself.
Yes, the Blackberry phone is a GSM phone. GSM stands for Global System for Mobile Communications. http://electronics.howstuffworks.com/question537.htm
If your phone is a GSM phone, then it would not take messages without a SIM card on the phone. It would not even work without it.
You mean Blackberry? The Blackberry phones are smart phones that can be GSM, CDMA and those things.
It depends if the phone is compatible with a gsm network if so it has to be unlocked
I 3G phone has the ability to use the internet at 3G speeds. A GSM phone is a phone with a sim card that if unlocked can be used in most places in the world. GSM carriers in the US include AT&T and T-Mobile. 3g phones makes online surfing possible. GSM phone can be used most place in the word.
A GSM fax machine is that a fax machine that connects to the phone network through GSM (Global System for Mobile) (aka cell phone technology).
If your 3G phone is both GSM and CDMA, then you can't do anything about it. You would just have to use it on GSM carriers. Now, there are some 3G phones as well that is just GSM-based, so you would not have to worry about locking it to GSM only. All you need to do is find out your phone's specifications.