Hi Adriennep, thanks for responding! I didn't have this issue with my prior phone. I've never seen an issue making a call yet. I'm currently running 10.0.3 (14A551). I see there is an update available (10.1), so I'll install it now and post back if more issues occur.
I had the issue occur again today, but it was a little different this time, and very strange. I received 5 text messages at the same time, all from my husband. He had sent the first text about 7 minutes earlier and when I didn't respond he texted a few more times. He also tried to call me during this time but I never got the call and he said it went straight to VM. About 5 minutes later, I was with my husband and I received a call from him. The problem is that he was NOT trying to call me at that time. It is like it was the call he tried to make 5 minutes earlier just getting through to my phone (which doesn't make any sense). When I answered it, the call connected and there was just silence. My husbands phone was not in a call at all. He also has an iPhone and is on Verizon, and he's never experienced the issues I've had.