Iphone 4 signal problems

i have an Iphone 4 that has been unlocked through apple. the operation of the iphone itself is fine, its just that it shows no signal and then pops up signal in random areas. however whenever i run my errands of some sort and come upon a area that has GREAT receptoin, it begins to work. when i move from that area, it stops working once again. what can possibly be the problem? please help.

I started having problems with calls being dropped after I updated the OS. The battery kept getting warm and drained quickly. I sent the iPhone back for repair and they told me there was nothing wrong. I spoke with several people who had AT&T and iPhone 4 and we all had reception problems AFTER the update. I have had to have the phone replaced twice within a month after the latest update. I think it is a software issue since I keep running into people with the iPhone 4 with same signal or battery issues. Think I will wait before upgrading to the 5S or 6 given the problems I am hearing about the current model.

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