My iphone 5 will randomly lose T-Mobile service and start roaming on AT&T multiple times during the day, and it'll switch back after about 15 or 20 minutes. I know it's not because I'm in an area without T-Mobile service because I have 5 bars of service, but then I'll start roaming, which does me no good since I've used up my roaming data. I'm not sure if it's because I get a strong 4G signal from AT&T or what. How do I get it to stay on T-Mobile?
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