My phone only rings for about 10 seconds

And then it hangs up before I can answer it.

What's with that? I can't see a setting to change how long the bloody thing rings for, either.

I have a song from the sd card set as my ringtone, but it's about two minutes long so it can't be that...

 

My hero. Thanks.

Weird that the default was set to 10 seconds.