Iphone is one of the most favorite phone of everyone. Making is the most basic feature in everyone phone. But many users are facing Call failed when calling someone iphone issue. It is not possible to say any particular reason behind this issue. But you don't need to take stress about this because here I have come with few solutions:
Restart your iPhone
Turn off and on Airplane Mode
Dial *#31#
Remove and reinsert SIM card
Reset Network Settings on iPhone
Reset All Settings
Update your iPhone’s software