Support Not receiving calls/texts until I restart the phone myself.

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http://androidforums.com – Today, it seemed my Galaxy S3 wasn't receiving any calls/texts for quite some time. I only realized this when I tried to send the same text a few times and it just wouldn't send. My first thought was to restart the device and after doing so, I saw a voicemail and a few texts I had missed. What would be causing this? Not very convenient when you're expecting something important to come through! (General)