Why can’t I make calls?why
Why can’t I make calls after changing my SIM card
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Review this guide published by Apple ➔ If you can't make or receive calls on your iPhone
Furthermore, did you just switch cellular service providers and inserted a new SIM card for the new provider? If YES, then which message do you see on your screen when you attempt to make a phone call? Have you contacted your cellular service provider? If NOT, then please do so in case your new SIM card is not activated.
Axel F.