We have aVonage box in our house in the Philippines, plugs into the internet router, It has a phone connected to it. I pay about £6 per month, It has a UK no and the same std code as our home town. If we phone them from the uk it is a local call (we have another box here as well so its free vonage to vonage) If they phone us on our landline no , or infact any uk landline no its free, Its great for phone calls back to the uk when we are out in the Philippines , we can spend hours on the phone without the worry of the cost of it all.
When my wife came over to the uk 20 years ago BT was the only way to call and it was someting like £1.80 per minute!