Skype gave one month free worldwide calling with a landline in over 40 countries or call mobile phones in 7 countries.
To get the offer, you must have or create a Skype account and provide valid payment details. After the first month, your subscription will automatically continue and payments will be taken monthly unless you cancel subscription within 27 days from the start of your trial (free trial runs one month despite cancellation of recurring subscription). Only one Skype Premium with Unlimited World subscription can be claimed per customer. Offer not available in China, South Korea or Taiwan.
Skype Premium is normally $9.99 a month.