This was just posted on FaceBook forums a few minutes ago. I tried it, and it works.
Change your ringer to 30 seconds long, before vmail kicks in.
Well I actually found something useful from the Apple forums.
How to Extend your Ringer Time
From: BCammaratta
Here is what i know about the ringer time.
First type *#61#{SEND}. Your iPhone will show where your voicemail calls are
being to sent to. Write down the number as for you will need later. Second type
{STAR} {STAR} 61 {STAR}{the number you just wrote down}**30#{SEND}. When you get
the confirmation dismiss it. Finally, check that your calls are still being
forwarded to the correct number. Type *#61#{SEND} and verify its the same number
as before.
There you have it, your now 30 second ringer.
Where you see {STAR} it means *, i couldnt get it to show it correctly
Change your ringer to 30 seconds long, before vmail kicks in.
Well I actually found something useful from the Apple forums.
How to Extend your Ringer Time
From: BCammaratta
Here is what i know about the ringer time.
First type *#61#{SEND}. Your iPhone will show where your voicemail calls are
being to sent to. Write down the number as for you will need later. Second type
{STAR} {STAR} 61 {STAR}{the number you just wrote down}**30#{SEND}. When you get
the confirmation dismiss it. Finally, check that your calls are still being
forwarded to the correct number. Type *#61#{SEND} and verify its the same number
as before.
There you have it, your now 30 second ringer.
Where you see {STAR} it means *, i couldnt get it to show it correctly