AT&T Wireless
AT&T uses MMI-style star codes. Dial the sequence, then tap Send/Call.
Forward every call (immediate)
**21*{FORWARDING_NUMBER}#Forward when no answer
Rings a few times on your cell before forwarding.
**61*{FORWARDING_NUMBER}#Forward when busy
**67*{FORWARDING_NUMBER}#Disable unconditional forwarding
Use this when you want direct calls back.
##21#Notes
- AT&T's MMI codes (the
**21*-style sequence) work on both Android and iPhone — no separate iOS setting needed.