Animated bells taking over my Nokia 1110

Anybody have any idea what’s wrong with my mobile? I have a Nokia 1110, which suddenly yesterday has got a row of animated bells onscreen. They cover up the numbers which I input, and are very distracting. I have no idea how they got there, certainly don’t remember doing anything unusual, and I want them gone. I’ve tried adjusting the screensaver and downloading a new logo. Neither had any effect. Does anybody know what this is, and how do get rid of it?