Landline calls are generally much cheaper, especially if you go via a rerouter such as 18866. My wife frequently makes hour-long international calls for 2p or 4

Landline calls are generally much cheaper, especially if you go via a rerouter such as 18866. My wife frequently makes hour-long international calls for 2p or 4p per minute when the Vodafone charge on "pay monthly" is £1.50 per minute. On my UK mobile, it costs 10x more to call my son in the next room than to call the USA. Of course, it all depends on the mobile deal you have, who you call, and where they live....