How to unlock verizion s4 on srraight talk but with AT&T?

[Pamela 64]

I have Verizon s4 on straight talk plan but wants to unlock it to use with AT&T sim card .I have a Verizon sim card currently using but want to go with AT&T. Better service with AT&T. Please help

 

[SophiaPetrillo]

After looking it up, apparently the S4 from Verizon is unlocked out of the box. Just put in your AT&T sim and APN.