The solution below shows the connection line paths of the Samsung B7510 SIM card connector and which components needs to be check first.
Just see the solution preview below for it shows which track to be check and make jumper.
Samsung GT-B7510 Sim Connecter Jumper,Ways,Problem Solution
Samsung B7510 Sim Card Not Working Ways Repairing Solution
Samsung GT-B7510 Insert sim Solution Jumper
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