So this morning all my calls started going directly to voicemail. Phone tech support walked through every possible setting to no avail and finally suggested I get a new SIM card. The new SIM card did not work, nor did resetting, removing battery, etc so I was forced to do a master reset (three days of setting up my phone perfectly down the drain). This DID work and I can now receive calls but I wonder if my phone is defective. Has anyone ever had to do a master reset for this reason? This is the first time in a dozen android phones that it has happened to me.