How to Stop Call Forwarding From Your Landline
To disable call forwarding on traditional landlines:
Pick up your phone and dial *73. If your carrier is T-Mobile or AT&T, dial #21# instead. Wait for a beep or tone indicating that call forwarding has been disabled.
How to Turn off Call Forwarding on Android
First, check to see if call forwarding is enabled:
Launch the Phone application. Tap the Menu icon on the top right corner. Tap Settings. Older Android smartphones might say Call Settings instead of just Settings. Tap Calls. Tap Call Forwarding. If any of the options below are enabled, tap the enabled option and select Turn Off. Always forwardForward when busyForward when unansweredForward when unreached
How to Turn off Call Forwarding on iPhone
To disable call forwarding on iOS devices:
Always forwardForward when busyForward when unansweredForward when unreached
Launch the Settings app. Tap Phone. Tap Call Forwarding. Tap the Call Forwarding toggle switch to turn it to the off position.