Reader Ron B passes along an offer for unlimited free calling for a month using Skype.

The unlimited calling includes calls to mobile phones in a limited set of countries only and landlines in 40 countries.

Signup by November 15, and you must have an existing Skype account that’s been open more than 29 days. They require payment details and will auto-renew the service unless you cancel within 27 days of your start date.

The mobile phones are liimited to Canada, Guam, Hong Kong, Puerto Rico, Singapore, Thailand and United States. (They consider Guam and Puerto Rico to be ‘countries’.)