Network or no signal problem on a cell phone can caused by many reasons. The most common is because the solder lack. Solder lack is a condition where the tin quality is not good. In Nokia X3-02, the network problem can caused by bad contact on N7510 and N7520. When you find the Nokia X3-02 network problem, you can try to re-hot the N7510 or N7520 integrated circuit. Look and save the picture below.
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