cant get signal with new Sim/account

Hello, My daughter been playing with my old AT&T Note 2 so I got her a Sim so she could use it. Well it wont get a signal BUT sometimes it will show a AT&T with a G or an E and and I look and it doesnt show a phone number it says unknown but my phone wont get a signal. Could there be something wrong with my phone or could it be on their end? I reinstalled 4.4.2 through Odin and same results.

Thoughts?

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