Backspace

That is because once you have entered a number into the keypad when on a call, there is no way to retrieve that number. You cannot backspace and fix that. Once the tone is sent, it is sent. It cannot be recalled. You cannot do that on any phone.

Are you referring to a phone number in the numeric pad? When dialing a number and you have entered an incorrect digit, the backspace key will appear to the right of the green button to dial the call.

You are welcome.