To solve Signal related problem in nokia 6300 3110c 3500c first full flash the mobile with latest firmware and write good pm file.If signal problem not solved then it is hardware problem.Disassemble mobile and check antina points.Here is a diagram hardware signal problem solution.Observe diagram and do signal ic jumper as shown in diagram below.
Nokia 6300 signal ic jumper and nokia 3500 pa ic jumper diagram

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