How do you get number of unanswered call?

Question

I'm getting lots of spam phone calls.  How do I find the number of who called if I answer it.  Missed calls show but not unanswered calls.

Answer 1

Yeah, if you did the reset and the restore, it's likely a hardware issue. I would try plugging in headphones and see if you can hear clearly through those (i.e. the ones that came from the phone). If you can, its likely an issue with the speaker in the phone. You can also try the phone on speakerphone and without speakerphone to see if the noise happens both ways. This would help narrow down the cause.
Also, just as a quick thing to test you can go to Settings and toggle airplane mode on and off a few times. Turn Wifi and hotspot off as well as location services. You can also click on carrier and select your carrier to see if that makes any difference (with any possible connection issues/interference). If you go into Settings and then General, you can test turning off 3G to see if the noise goes away. You can try turning off Cellular data etc.. Just see if turning off any of these things makes the buzzing decrease. Theres also settings under General for 'Reset' and theres an option to reset network settings, which is also worth a try at this point.
If you have an Apple Store near you, they're amazing and they'll usually replace your phone on the spot (if you're within warranty).