AT&T iPhone not getting Internet?

I just got an iPhone 4S with a 2 year contract with AT&T in June. It runs on 4G and has worked perfectly up until this past monday. When I was in school it just kept loading and loading and eating up my battery, it never connected. Over the next few days, my service started to drop also. The 4G symbol in the top left disappears on and off frequently and sometimes it just says "No Service".

I talked with my friends who have AT&T iPhones and they said nothing was wrong with their phones in the school. Plus my phone had been working inside the school perfectly up until this week, so its not the school.

I went into the AT&T store and the man did a hard reset on it. I left the store and it worked until the next day when I went back to school. He gave me a new SIM card so I activated it with customer service last night. Once again it seemed to be working fine… Until I went to school today.

What is wrong? This is ridiculous that i pay $30 a month for internet and it won't even work and it's eating up my battery in just a few hours!

Back to the store. Sounds like a lemon.

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