UKVoIPTalk.com

Have been with voiptalk for about 8 months now, having ported my old pstn number to them before I moved house to another exchange. It was the only way I found to keep my number.

The pricing is pretty good - £1.99 per month including a geographic number. If you want advanced diverts and so on it's £2.99 and for that the outgoing calls are slightly cheaper. An incoming non-geographic number is beween 5 and 10 pounds with no monthly charges.
Note: don't get an 0870 number as they are changing this year and it may no longer be free or even work!

For outgoing calls voiptalk are pretty cheap eg landline 1.4p minute, mobiles from 5p min off-peak. Calling 0800 numbers is free, as are other voip destinations.

The connection quality is pretty good, though I found it was most influenced by my router. Initially I used a softphone and USB handset which was rubbish. When I upgraded to a Fritz!Box router/ATA it dramatically improved.

Occasionally I experienced dropped calls and voiptalk couldn't explain why. It may have been my ISP but would occur a couple of minutes in to a call. In recent months reliability has been good.

One big plus was that they offer so many options to control your numbers. Forwarding to other sip numbers, diverts on busy to any other numbers, diverts to three numbers at once, voicemail, faxtoemail etc etc.

Support is pretty good. I always get a reply to a support ticket within 12 hours and you can call them if it's urgent. They used to have a forum which I valued for answering those 'daft' questions that I always have with a new service, but the forum has been dropped and despite plans to, they haven't launched a replacement.

To be honest I'm not sure if I'd bother with voip if I only had one number but as this was the only way to ensure number portability and to have a second line for my secretary then I'm happy with voiptalk.

Hope this helps

Colin