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Stop screen turning on

Since you wouldn't know that there was a call, it would go to voicemail after ringing a few times (which you wouldn't hear). Put it in airplane mode. If you want wifi or Bluetooth, you should be able to enable them without disabling airplane mode. It accomplishes the same thing. First all the radios (including the phone) are turned off, then you turn on all the ones you want except the phone.
 
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