Sony Ericsson z520a

i have a sony ericsson z520a. my cell phone stoped recieving signal at home but works fine in some places. the signal bar goes up and down as i watch it. i unlocked the phone two weeks ago but still have same problem. i tried my sim "provider is Fido" in motorla v3i and sony ericcson w810i, it works fine. this is driving me crazy. i m not sure if my phone was droped or anything, i can't recieve calls at home and can't text message.

please help.
thanx.

Sounds like it might be a hardware problem. This is an electronic device, so there might be a bunch of reasons that would lead up to your problem with your phone. Perhaps the antenna was damaged or something, IDK. Best bet is to bring it to a cell phone repair center and have them look at it. There should be a few shops at Pacific Mall that you can check out. Either that, you can always just buy another one because they are pretty cheap nowadays.