Siemens M55 signal problem.

Hello, i have a Siemens M55 cellphone currently on the FIDO network in canada, i recently changed the casing on my phone as the screen was badly scratched on the original casing, i had it done by one of those cellphone guys at the kiosks in the mall, after i had it done my signal strenth dropped drastically now i can hardly even make a call without it cutting out, i never recieve any calls, people say when they call me it goes straight to my voice mail. Is there anything i can do to fix this? Does the factory casing have anything to do with the antenna?

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i can only recommend you - > go to service

probelm solved, yesterday i took it apart and put the factory casing back on, full signal now, there must be some sort of shielding in the factory casing or something, so a word to all m55 owners DONT change the casing, dropped my signal drastically made my phone useless. And i tried to go to fido service with the casing changed and they dont even want to look at the phone let alone try and fix it. So keep the stock casing.