Need to type “1” in front of phone number
Since I upgraded to iOS 15.7, calls using only my ten digit number will not get through on my iPhone 7. They only get through if you type in a “1” before the number. What’s going on?
iPhone 7
First go to Settings/Phone and make sure “Dial Assist” is turned on. After that, contact your carrier. It has nothing to do with the version, but your carrier may have changed the dialing protocol.