[iMore Question]

When I phone certain numbers it rings once and cuts off

[phreddyl]

Could be many things- maybe you don't have the right number- maybe the person is sending you into voicemail- maybe something is wrong on the other line- If you have some calls connect then your phone is fine

[Jaguarr40]

Are these numbers all local or a different area code although I would lean towards the first advice.

[Just_Me_D]

When I phone certain numbers it rings once and cuts off

Is it possible that the people you're calling from those particular numbers are immediately sending your calls to voicemail?

[nikkisharif]

The advice given seems spot on. Sounds like somebody doesn't wanna talk to you or you call them when they're in the middle of something. I do it all the time...just double tap the sleep/wake button.