With a Tesco mobile sim the phone keeps coming up with the sim not detected fault, restarting the phone clears it for a short while then it comes back. The sim works perfectly in another phone, I've replaced the sim with a new one from Tesco and same problem. I the fitted a 3 sim in the phone and that works perfectly, any ideas please.
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With older cell phones I've had similar issues I'm sure you may have tried this but in case you haven't I've found gently cleaning the contact points on the actual sim card with a pencil eraser will improve electrical contact since the tiny metallic points that hold it in place may be wearing down the actual sim card which probably has become slightly contaminated with dirt and oils from ungloved handling while removing and inserting the item into your phone its free to try and couldn't hurt just be careful not to break the fragile gold color sim contacts. Good luck!
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Nothing to do with “dirty” sim contacts as I said in my question that I got a new sim from Tesco and have the same problem but it’s fine with a 3 sim. Problem only happens with Tesco sims.
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