This solution applies to Nokia 301 Insert Insert Sim card problem can occur in these phones in case of damaged Sim connector.
Nokia 301 Sim Ways Jumper
Nokia 301 Insert Sim Problem
Nokia 301 Insert Sim Jumper Solution Second Sim Card Full Ways
So first of all you should check if the Sim Connector in Nokia 301 is busted and replace it. If that is not the case then you have to replace the Sim IC placed near the Sim Jacket. I have marked the the Sim IC in the following diagram.
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