Can't be @rsed going onto Nokia for this, there's more intelligence here!
My Nokia 5800 has started to lock-up when making calls. The call goes OK but when I go to hang up the screen is blank, all three indicator lights are on and the only way to clear it is to remove the battery and then power it back up.
Anyone had similar problems and know of a fix?
OS and software are up to date. I'm on Vodafone and my daughter's on Orange does the same thing.

