insert sim problem in Nokia 3250 for both sims or a single sim is not working here is the diagram that will help you to solve this problem in Nokia 3250.
Nokia 3250 insert sim ways full jumpers
Nokia 3250 insert sim problem can be solved by follow the easy steps. first confirm that mobile sim is not faulty, then disassemble mobile and check sim jacket points on mobile motherboard with  digital meter. if any point damage then apply jumpers like diagram above to any missing point.

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