I don't see why you will need to 'change' to Tiscali. You log on using the account that's on that line, once connected you can go anywhere. You may need the Tiscali home page if you use their webmail I guess. The great thing about normal home broadband connections is that they don't cost any more the more they are used (within any max usage plan) so you using it won't have to cost any more than not using it.