My ringer stopped working. Any ideas?

Is the silent switch on the side of the iphone on?

I had same problem. The ringer worked with headphones on. I went to settings, sounds, slid volume control for ringers and alerts down and then back up again and the ringer worked fine. Have no idea what the problem was, but this seems to have fixed it for now.

I've got this problem too -ringer doesnt ring. Ive tried sliding the volume button as you suggest, I've also checked the on/off volume button, do not disturb and blocked callers. Nothing works. But I dont think its a hardare speakers thing because if I just play a ringtone it works fine. Any ideas?? I have a phone that doesnt ring...