TT = TalkTalk & they are owned by Carphone Warehouse!
We personally use a Smaller Company called Call-4-Less (
www.call-4-less.co.uk)
Calls to the USA cost only 1.99pence per minute & no connection fee, so when I make a quick call I dont get charged more than I should
The call quality is excellent as it is not internet based, so as clear as BT calls are, but we save every month
The calls to Mobile phones in the day is also less than my previous supplier, they cost 9.99pence/min
The line rental is not much less tho, at £9.35 per month
Hope thats some help