Apple iPhone 15 Pro Max

Apple iPhone 15 Pro Max

iOS 17

iOS 18 iOS 17

I can't make voice calls on my Apple iPhone 15 Pro Max iOS 17

Cause 2 of 3: Missed calls are diverted too fast

Your missed calls are diverted after a specified number of seconds. If your calls are diverted too fast, you need to select a longer period of time.

Solution: Set divert delay.

Step 1 of 8

Find "Keypad"

Press the phone icon.

Step 2 of 8

Find "Keypad"

Press Keypad.

**21*+447836121121#

**21*+447836121121#

**21*+447836121121#

Step 3 of 8

Divert all calls

Key in **21*+447836121121# and press the call icon.

**61*+447836121121*20#

**61*+447836121121*20#

**61*+447836121121*20#

Step 4 of 8

Divert missed calls

Key in **61*+447836121121*20# and press the call icon.

**62*+447836121121#

**62*+447836121121#

**62*+447836121121#

Step 5 of 8

Divert if unavailable

Key in **62*+447836121121# and press the call icon.

**67*+447836121121#

**67*+447836121121#

**67*+447836121121#

Step 6 of 8

Divert if busy

Key in **67*+447836121121# and press the call icon.

Step 7 of 8

End call

Press Dismiss.

Step 8 of 8

Return to the home screen

Slide your finger upwards starting from the bottom of the screen to return to the home screen.

1 Find "Keypad"

Press the phone icon.

Press Keypad.

2 Divert all calls

Key in **21*+447836121121# and press the call icon.

**21*+447836121121#

3 Divert missed calls

Key in **61*+447836121121*20# and press the call icon.

Key in the required number of seconds before the call is diverted, e.g. 20. The number needs to be divisible by 5.

**61*+447836121121*20#

4 Divert if unavailable

Key in **62*+447836121121# and press the call icon.

**62*+447836121121#

5 Divert if busy

Key in **67*+447836121121# and press the call icon.

**67*+447836121121#

6 End call

Press Dismiss.

7 Return to the home screen

Slide your finger upwards starting from the bottom of the screen to return to the home screen.