unlocked phone problem
I have a T-Mobile note ii, I'm using it with a straight talk T-Mobile sim, which works good but I don't get good speed here where I normally would with at&t. I flashed a 4.1 ROM and used the correct modem for it, I Can now put the at&t sim in it but when I try making a call it says I'm not registered on the network. I've messed with apns a bit to no prevail. Thanks in advance.