Ethnic MVNO Lebara is offering half price calls to eight Eastern European countries until the end of November.
Customers will be able to call landlines in Romania, Latvia, Lithuania, Bulgaria, Poland, Russia, Hungary and Slovakia for 2p per minute.
The discounted calls are to promote calls during national days across the Eastern Europan countries.
Lebara Mobile UK managing director Russell Atkinson said: “Our service is particularly popular for calling the Eastern European countries and we have an extremely loyal customer following for this region.
“With the number of national events coming up, there will be a lot of people who want to call home. Our latest offer will enable these customers to stay in touch with friends and family for less.”