Samsung Galaxy J1 SM-J100 Sim Card Not Detected issue occurs mainly because of hardware issue. There is a chance of one or more faulty sensors in the Sim card slot. The sensors also may become dirty. If the problem is just dirt, the take out the Sim card from slot and blow an air into the area. It will remove the stuck dust particles in the sensors. But if you realize the sensor is defective, then get it repaired.
If your phone is water damaged and if you find any green carbons on Sim card terminal contact pads, you must clean them.
Note: make sure that sim terminals are perfectly connect with contact pads.
Then, check the fuse resistor and filers using muti-meter, change them if it shows short or damage. then check the two contact pads of sim card are connected to fuse-resistor and filters.
If it not connected, you should put two jumpers to fuse-resistor and filters from the terminal contact pads.If you have any further Questions please leave a message.
Keep in mind:- The every solutions posted on Our website is well tested before by our specialist team, But still we do not take any responsibility for any damage it may cause to your cell phone. Use these repairing solutions at your own Risk, Thank you.
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