My phone is on but goes straight to Voice Mail?
 

Sometimes when people call my phone apparently goes straight to voicemail. And I never recieve a notification of a missed call. I can recieve text, and go online but I cant recieve a call. Anyone else experience this? And my phone is ON and not in airplane mode. Can anyone shed light on this situation?

Do you use any push services? It's possible they are calling just as your phone is dialing out to the net so it won't suspend the internet because you're still connecting to it. If you get this problem from people often then I doubt this is the scenario but if 1 or 2 people in a week say something this is probably it.

well in my home I have my WiFi running on my phone 24/7. You think its because of that? I wasnt using the internet when my friend was trying to call me. I didnt realize I was missing calls untill my friend sent me a text message asking me why my phone kept going to voicemail.