VoX Communications, a cloud-based voice/video solutions, apps and services provider, is offering the first month of international calling free as part of its Yahoo Mobile advertising campaign. The promotional code to receive the offer is FREEPLAN. A VoX user can subscribe over the air and choose a U.S. phone number without leaving the interface. The Basic, U.K., Brazil, Mexico and India plans are included in the promo…ION Rewards – a free app that pays consumers to buy the things they always buy, pay with their phones, connect with friends and sign up their favorite places – now is available from Atlanta-based Sionic Mobile; 1,000 ION digital rewards equals one U.S. dollar. ION uses next-gen Dwolla payments that allows users to earn digital ION rewards by paying with their phone at any ION merchant…C Spire Wireless is offering subscribers the chance to show their creativity and love of “PERCS” with today’s launch of “PERCS means Prizes,” the carrier’s first user-generated, multimedia contest surrounding its PERCS rewards and consumer-engagement program. The contest, open to C Spire customers and the general public, kicks off July 16, giving participants the chance to show how they use and benefit from their PERCS rewards by submitting photos and videos online. Participants vie for as many as 1,000 PERC points, and each category winner will get $1,000. The final PERCS star talent will win the $5,000 grand prize.