This solution is for Nokia Asha 305 and Nokia Asha 306 Network Problem. It works on both of these phones despite their SIM differences.
No network or signal problem in Nokia Asha 306 can occur because of faulty antenna. I have marked Antenna Connector ways in this following diagram. I have marked all the jumpers points I could find, also I have marked two ICs in the diagram. If you are sure the antenna it properly connected to the motherboard repair or replace them.
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Here are Nokia Asha 305 and Nokia Asha 306 Network Ways Problem Solutions. Please study these diagrams very carefully before you start repairing.
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