Not getting calls on iPhone

Okay, long story short, I'm a realtor and my job fully relies on my phone. I started having problems yesterday when I was sitting in training and my phone vibrated. I had a voicemail, but it had not vibrated with a call. I didn't think much of it but then when I was driving I looked at my phone again and I had a voicemail. It didn't ring. After that I had my mom call me to see if it was working and it rang fine.

I had my phone with me for the rest of the day until I went to my night job at 5. Occasionally I peeked at it. I got a few text messages but no calls. When I got home at around 9:30, I noticed that I had a voicemail from 4:11 earlier that day. And that was before I went to work when I had my phone with me.

Then this morning my mom called me again and told me that I had someone who wanted to sign a contract with me not being able to get a hold of me! My phone has been sitting next to me all morning and I only got a call from my mom. I don't even have any missed calls!

This needs fixed now. If we didn't know these people I would have lost pretty much $7, 000

I have an iPhone 4S with Sprint. Could I have accidentally changed a setting? How can I get this fixed, what do I do?

Added (1). Also, "Do Not Disturb" is not on.

If there's a halfmoon on your status bar, goto settings-dont disturb and yeah. If not, soft-reset hold home and power until screen goes off.

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