I have been having this problem off and on since August. I am not receiving my voice mail or text message notifications, nor the actual messages until 4-5 days later. They seem to be banking up somewhere and then I get all of them at once, many days after the fact. I have had the phone replaced and the SIM replaced. I still have the problem. Some days, I do not have a problem at all. It is sporatic. The problem seemed to start once I started tethering my computer off of it. Any advice?