My mobile data doesn't work. I get 4G/H+ for the first 15 seconds i turn the phone on, and then it stops working. I have signal and can make calls fine, just no data.
This problem began after i went on a trip to South America and put a Sim card over there in my phone. Then when i got back to the US I got this problem. I've checked APN, deleted it and created a new one, and still same problem. I've tried another Sim card and it also had the same problem.