To solve signal problem in Nokia C1-02 look at diagram above and in it you can find some parts that are identified with red lines, Clean these parts with electronics cleaner and apply some heat so that they can be dry.
Do nto apply much heat because it can harm your skin and may can damage the motherboard of Nokia C1-02.
Check antina points also in the housing (casing) and also apply jumper to short antina that is used for external antina attachment in Nokia C1-02.
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