So today a friend called and complained about me not picking up his call. Apparently I was on another phone call when he called, but I never got his call, not even as a call waiting. Then someone else called my number, but he complained I didn't pickup, but he called my google voice number, which redirected my sprint number, it rang and I picked up. Then I get a voice mail from someone, but I didn't get any call before the voicemail came. So for some unknown reason I am not receiving some calls. I was at home whole day, and I always get 4 bars here, and even battery graph shows no red bar, meaning my signal was never an issue whole day today. Did it happen to anyone else here too? Is it phone or Sprint issue?