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my galaxy s4 sim & sd card are not registering anything keeps saying sim not registered how do I get this problem fixed pls

Hi, maybe the connection has just come loose. Here is a link that shows how to dis-assemble your phone and how to remove the SIM/SD Card reader board https://www.youtube.com/watch?v=9NNvCRW5… Here is a link to just one supplier for the replacement part. There may be others. It is just to show what it looks like. In case it is faulty http://www.etradesupply.com/oem-samsung-