Ok i had this happen before. it seemed to be somehow related to power management apps that would turn of radios while the phone was sleeping. So I removed everything but the Data widget. I've had intermittent issues since then but not enough to worry about. Well the past week the only time i receive texts or vm. Is when I make an out going call. It's also the only the only time that my out bound texts will actually send. I'm running an older version of miui which I've been lazy about updating. Could it be related to the rom deteriorating over time or do I have a radio thats trying to go out? Or something else entirely?