When your iPhone iPhone 6s shows ‘No Service,’ ‘Searching…’ or ‘Invalid SIM,’ you lose cellular connectivity entirely. This can be due to SIM card problems, carrier settings, or software glitches.
All modern iPhones and iPads now use nano-SIM cards. Unfortunately, this can be a bit of a problem for anyone switching from an older device, because the nano-SIM is much smaller than the micro-SIMs ...
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