These have been modified to work on my VoIP phone service instead of the original supplier's. What that means in simple terms is that when you pick up the phone instead of placing the call via a conventional means it is placed via my network which is much cheaper.
UK rates:
1.5p/minute peak time to landlines
0.75p/minute off peak to landlines
3.6p/minute to mobiles any time
Also International calls are much cheaper than BT, Skype, etc. (Ask if you want to know a specific one)
You must have broadband to use this but it can be from any provider. The modified home hub plugs into your existing router and, if you want, your regular phone line so the phones ring. Calls will use up some broadband data allowance but only about 10MB per hour of talking. In reality this isn't an issue but I'm mentioning it just in case.
Also works abroad (in most countries) at the same rates so you can ring UK numbers from abroad at non-international rates.
Another bonus is that all calls within the network are free so if you ring the same person for hours on end buy them a system too and all your calls between each other are free. There is no redialling after 60 minutes or anything like that, just free calls, and it also works even if one or both phones are abroad.
All calls are post-pay ie you will receive a fully itemised bill at the end of each month. There is no 'line rental', just pay for the calls you make.
Hub with phone
Hacked home hub with phone as above, all set up and ready to go = £30
Hub without phone
Hacked home hub as above without phone (to use with your existing BT-branded cordless phone) = £20
Extra phones between £15-20 depending on condition (includes new Duracell rechargable batteries).
These are second hand units that I have bought and modified (which usually involves some soldering inside) so expect some marks, scratches, etc.
Cheers, Chris