Hi, I have an ATT Nokia 6555, which I like very much. If I can get it unlocked, can it be used on Verizon?
To add to what Telekom said, your only option to use your unlocked 6555 on is T-Mobile (or any other regional/local GSM carrier). One effect of using the 6555 on T-Mobile or others is no 3G service (just 2G).