Originally Posted By: Acumowchek
If it doesn't wok, I can use AT&T, but not Sprint or Verizon.
The Verizon iPhone 5 allows both GSM and CDMA so you can choose your carrier. ATT is GSM only. The iPhone 4s is both GSM and CDMA. Just not their LTE networks on the 5, the LTE isn't compatible across phones if I've read things correct.

LTE is faster for downloads is all, which won't affect you unless you download a lot of stuff.

Verizon sells their phone unlocked. ATT will do it for you if you ask.