The Vodafone website is displaying an offer for free P-A-Y-G SIM's, and cheap calls abroad.
See
http://shop.vodafone.co.uk/special-offers/mobile-phones/freesim/?WT_ref=Homepage-Layer3-Banner-Intl-160408The calls abroad options are as follows:
We’re giving away FREE Pay as you talk SIM cards
Make low cost calls to China, Nigeria, Poland, Pakistan, Lithuania, India. There’s a 10p minimum call charge but after that calls to landlines are 5p a minute while calls to other mobiles are just 15p a minute. And with competitive rates to a whole range of other countries, calling abroad with Pay as you talk is affordable and hassle free.
Order your FREE SIM today and start taking advantage of our cheap international call rates.