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TMOBILE HELP [[help fast]]

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I have an unlimited plan with my friends and I put my sim card [the unlimited one] in my sidekick 3 phone and it doesnt work it says searching and I dont know why? I think its because my friend either didnt pay the bill or she cancelled the account but when I try to call some one or my voice mail it always says ''wireless services are currently unavailable'' and I always wonder why if you can help me or give me some advice as to why it does this please do tell me because my phone is very important to me [lol]