What if I'm still in a contract with my current provider?

Some contracts carry an exit fee if you leave early, most often broadband deals and fixed energy tariffs. Check your current terms before helloBill sets anything up, and ask your provider how any charge is calculated. There's more in "I'm not moving home. Will I be charged an exit fee for leaving my current provider?", and on what to do with an old account in "Closing accounts at your old address".