How to disable Call Forward

[slusagm]

@PM-Ang 

If you want to change to the 3G mode and then try disable Forwarding 

1. Open the Settings app on your iPhone.

2. Tap Cellular (or Mobile Data / Mobile Service).

3. Tap Cellular Data Options (or Mobile Data Options).

4. Tap Voice & Data.

5. Select 3G from the list of available network modes.

[slusagm]

 There are different types of call forwarding, and different codes to enable and disable them.

Type of Call Forwarding	What it Does	How to Enable	How to Disable
Unconditional	Redirects all incoming calls to another number.	Dial ‘*21*’ + ten-digit phone number + ‘#’ + SEND	Dial ‘#21#’
Busy	Forwards incoming calls to another number when the line is in use.	Dial ‘*67*’ + ten-digit phone number + ‘#’ + SEND	Dial ‘#67#’
Not Reachable	Redirects incoming calls when your phone is unable to take a call.	Dial ‘*62*’ + ten-digit phone number + ‘#’ + SEND	Dial ‘#62#’
No Reply	Redirects incoming calls when nobody answers.	Dial ‘*61*’ + ten-digit phone number + ‘#’ + SEND	Dial ‘#61#’
Variable	Redirects incoming calls after the call has not been answered for a specified period of time.	Dial ‘*004*’ + ten-digit phone number + ‘#’ + SEND	Dial ‘#004#’