iPad / iPhone stops receiving email - hard reset*, remove and replace SIM, restart
iPad / iPhone calendar stops syncing - update device software
iPhone: can’t phone out, can’t end calls, no ring tone – update device software
iPhone: can receive SMS text messages but cannot send SMS – refer to Telco who’ll need to adjust configuration
iPhone / iPad: no ringtone but speaker works – check the physical mute button on the side of the device
iPhone / iPad: can’t backup as iTunes...
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