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iPhone extend ringing before call goes to voicemail




Wednesday, March 05, 2014
AT&T USA

- dial *#61# and click Send.
- Some information should be displayed: number that the calls are being forwarded to and the delay before the forwarding engages.
- Write down the number (including +1)
- Dial **61*+1xxxyyyzzzz*11*30# and press Send. +1xxxyyyzzzz is the number you wrote down before, 30 is the delay in seconds. The delay can be set in 5 second increments, 30 is maximum.
- Dial *#61# to verify that the new settings are active.