sprint galaxy s4 sph-l720

[Esther Lowe]

I bought a sprint phone but I have att when i put in my sim card I can't get it ti register with att but the att network shows up how do I add a apn setting for att?

 

[Golfdriver97]

Welcome to the forums.
APN settings are in the mobile networks section in Settings. However, I believe you have to get the phone from Sprint unlocked to work on other carriers.