My iphone switches from the carrier network to no service.  What can I do?

I have a brand new unlocked Iphone 4s.  I took it to my carrier, T Mobile, to activate the sim card.  The phone now will fluctuate between T Mobile and No Service.  I have read that something may be wrong with the antenna.  Any suggestions?  If the phone does not improve by Mon. (3 days from now), I am taking it to a repair shop.

Hi KIA SHA, 
Welcome to the Apple Support Communities!
I understand that it must be very frustrating that you are receiving no service after upgrading your iPhone. In this situation I would recommend working through the steps provided in the attached article. 
If you see No Service in the status bar of your iPhone or iPad
Cheers, 
Joe

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