Hey everyone, My friend purchased a ZTE zmax Pro for me a few months ago from Metro PCS. I couldn't buy the phone myself because I am with AT&T. So when I purchased the phone, it was locked. Unfortunately, I had to wait the 3 month limit so I could automatically unlock it and start using it with my AT&T network. Well, a few days ago, I could finally unlock the phone. I was thrilled!! However, I noticed when I started text messaging, my messages would go through with the exception of picture of media messages. I read this has something to do with an APN.. I don't know.. Since I am with AT&T and not Metro PCS, I don't know if there is a specific APN I should be using or if there is something completely different I should do to fix this. I would appreciate any help anyone can give! This has been a struggle!