unlocking the phone

if i unlock this phone which i just bought, if its unlocked and i use it for t-mobile will everything work properly? do i have to be o att b4 unlocking it. please i dont want a wasted phone

NVonShats,

What it comes down to is radio compatibility.

From memory the Expo has 4 band GSM and triband UMTS or HSPA 850/1900/2100

so an unlocked expo will work on T Mobile GSM network (i.e. you should be able to recieve and make normal phone calls with a T mobile GSM)

From what I can research TMobile's UMTS network runs on the 1700 and 2100 MHz frequencies. So theoretically you may be able to get 3g network speeds with Tmobile. However, you should be aware that the Tmobile's 2100 frequency may only cover a part of their 3g network with the 1700 frequency covering the rest.

I guess what I am trying to say to you is that the expo will only be able to access one of TMobile's 3g frequencies. I am not sure how this will affect you because I have no idea of TMobile's frequency coverage.

If you are looking for a phone for TMobile and want to make sure of the best possible 3g coverage buy a phone with a radio supporting the UMTS 1700 and 2100 frequencies.