I am looking at changing my telephone provider from BT, at the moment I am paying £25 per month for unlimited calls to 01 and 02 numbers, an extra £1.50 per month for 20% off mobile numbers and the usual call divert, ringback etc etc, I also pay them £30 per month for 2mb Broadband, so a total of nearly £60 per month, I also pay Orange £50 per month for my mobile.
I have had a look at One Tel, who do unlimited 01 and 02 call, 2mb Broadband and 120 free minutes per month for £50 per month, or all the above without the mobile deal for £30 per month, which is the one I am looking at, however after the £30 you still have to pay BT for the line rental, or One Tel, which is £10 per month.
So the total costs for each as I read it is...

BT £60 per month
One Tel £40 per month

So I would only save a fiver per week, and I don't think it is worth the hassle for £240 per year.

Who do you use ?

Telenor - £250 a month. £1 per sms

BT Line with www.18866.co.uk. BT Line rental about £10.00 a month. Unlimited local & National phone calls using 18866 prefix for only 2p per call.

18866 is great, call any UK Landline at anytime and whether you talk for 3 mins or 3 hours you only pay the 2p connection charge, even at peak times. No Subscriptions, and no monthly fee

Mobile:- 02 PAYG - £10 top up per month for 100 free X-network anytime minutes + £10 call credit.