Text messages / phone calls delayed intermittently

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http://forums.androidcentral.com – I have had intermittent problems with receiving texts and calls since day one of getting my first Android device from AT&T over a year ago. About every few weeks or so, text messages I receive will be delayed by 4+ hours from when the sender sent them until suddenly my phone alerts me to a ton of messages all at the same time. At the same time, I can be alerted to phone mail coming in with no indication that there are any missed calls on my phone, but the caller states the phone rings and rings on their end with no answer. This has occurred with multiple callers/senders using multiple d (HowTos)