814 htc evo

I'm still receiving texts hours late and some even a day late, and iv come to notice that if I shut my phone off and turn it back on il get messages I never got which are from conversations which occurred days ago or my device will send messages that I thought sent but never did days ago... And now my phone when someone calls me is apparently going straight to voicemail and it never rings on my end nor do I get the voicemail they left for atleast a few hours or even a day!! and my friend with an ltevo is having all these same darn issues anyone else experiencing these voicemail, calling issues as well as texting? And do we have any word from sprint?