IPhone 4 T-mobile signal loss?

Genardas

New member
Ok so here let me start from the beginning. I got an iPhone 4 brand new factory unlocked using on tmobile. It was working perfectly but the I realized that the mic next to the cam wasn't working. So I went to the apple store they gave me a new iPhone and the guy at the apple store said he unlocked it for me. We tried activating it at the apple store it did not work it said invalid sim or something. So I went home all mad that I got an unusable phone. I tried activating it on my pc at home and it worked. So later on I realized that I lost signal randomly for 4-9 sec at the most. I would get mad cause I would want to text but it would be gone and I would have to wait 10 sec for it to work again.

About my phone

FirmWare: 4.2.1
Sim: tmobile
Baseband: factory unlocked

Why is the signal disappearing?
Does any1 else have this problem?
Should I try fw 4.3
 
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