1. iMore Question's Avatar
    I am using my daughter's old iPhone 4 after it has been unlocked by AT&T. Everything works fine except the incoming calls go straight to the voicemail box when the phone is in sleep mode. Neither sound nor vibration with incoming calls in sleep mode.
    12-01-2014 04:20 AM
  2. alicepattinson's Avatar
    Still in what iOS version your iPhone 4? Try update it to latest iOS version that is compatible with your iPhone 4.
    12-01-2014 05:58 AM

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