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Hello there,

Your iPhone 6s has a problem with the SIM card. remove your Simcard clean it with a soft cotton cloth and insert it again.

if that doesn't solve the problem contact your SIM card operator to find out the problem. Maybe you need to change the SIM card.

ayan ~ Does your iPhone 6s still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health

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