Hello.
In September,'m going to visit the United States of America. 
My phone Nokia 625 supports GSM frequencies 850/900/1800/1900
3G WCDMA 850/900/2100
4G LTE 800/1800/2600
My home operator MegaFon-Moscow. (network code 250 02)
International roaming is connected, the roaming agreement with AT & T concluded.
I can use my phone on the network of AT & T?
Solution
You should be fine with voice & data on at&t`s GSM/GPRS/EDGE network, as your phone does support the required 850 & 1900 MHz bands. You may also have 3G coverage, but only in areas where at&t supports 3G on the
850 MHz band.
I hope this helps.
850 MHz band.
I hope this helps.
