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Homtom S16 phone

Did this problem just start happening recently or has it been a long-standing one?
Have you tried restarting your phone? That's one of the first things to try. You might also want to just re-seat the SIM card in its slot and see if that makes any improvement.
If you have access to another phone (i.e. friend or family) try putting your SIM card in their phone and see if the same problem is still occurring. If it does or does not that might help indicate if the problem is with your phone or just the SIM card itself is failing (hopefully the latter as it's easier and cheaper to just get a new SIM card from your carrier).
 
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Just to repeat, have you tried re-seating the SIM card? Or have you tried using the SIM card in a different phone to see if the same problem occurs?

Or have you contacted your carrier about this? They might have more relevant info about what the problem might be. It could be the SIM card itself is the problem and getting a replacement might help.
 
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