How to turn off call forwarding on my iphone?

I used the settings/phone/forwarding but it will not turn off.

Added (1). Wireless service provider says they can't do it. They say it's the phone settings.

You have to turn it of with your wireless service
call or log into their website.

Try to reset your setting on the phone. There might be a glitch in your ISO software.
Go to Settings - General - Reset - Reset all settings.

This will not erase any content on your phone. Just do not hit the "Erase all content and settings" under "Rest all settings"

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