Phone calls
i am unable to call another mobile from my iPhone, says call failed. However I can call landlines
iPhone 7
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iPhone 7
Try to optimize the range of the mobile network, see this Apple article:
If you see No Service, Searching, or SOS on your iPhone or iPad
If you see No Service, Searching, or SOS on your iPhone or iPad - Apple Support
Then check -> iPhone 7 Repair Program for "No Service" Issues
iPhone 7 Repair Program for "No Service" Issues - Apple Support
Then see -> If you can't make or receive calls on your iPhone
If you can't make or receive calls on your iPhone - Apple Support