IPhone 4 service not working properly?

I recently replaced the screen on my 8gb iPhone 4 and then realised there was a 'searching…'/'No service' error. When on settings and searching for carriers, it wouldn't find any either. I discovered that the little blue coil was missing so i baught one and replaced it. When i turned the phone on, i left it for an hour and on the lock screen it said it has one bar of service (on orange/t-mobile) however as soon as i unlocked it, the signal went back to 'no service', I tried manually searching for carriers and it now finds 'O2 UK' and 'Vodafone UK' but nothing else (as the phone is locked to orange/t-mobile).

Does anyone know how to fix this problem?

Best luck.
http://support.apple.com/.../kb/ts4429

http://thinkios.com/forum/fix-no-service-problem-iphone-4-a-72.html

I woz aving problams wiv iphone5 battery draining i woz told chance battery i did on my iphone4s ANYWAY not done a good job how can i get it fixed n how much

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