Why does my Iphone ring twice then go to voicemail?

Why does my Iphone ring twice then go to voicemail?

There's a default setting for how long it will ring before it goes to voicemail. Don't know if this is still current, but this FAQ tells how to change the default:

http://www.iphonefaq.org/archives/971382

  • Why does my iphone5 receive text messages twice? When my iphone5 is on the lock screen and I receive text messages, unless I respond or look at it right away I will receive the same text message a minute later. Does this happen to everyone? How can I turn this off? It's very annoying!
  • Why does my iPhone ring when I didn't actually receive a text? It happens sometimes, my iPhone will ring as if I got a text, and then I check my inbox but I don't have any new texts. Does this happen to anyone else?
  • Why does my iphone ring twice? Lately i've noticed that my phone will ring when i get a text… Then will ring again for the same text a few minutes later if i haven't checked it. its just annoying because it makes me think i'm getting two texts and only getting one… how do i fix it?
  • Why does my iphone not ring only vibrate? Also some apps have no sound. Do you think its the mute button is jammed but then again it says its on ringer.