ATLANTA--(BUSINESS WIRE)--Sionic Mobile, a mobile commerce leader, today announced it is more than doubling the number of merchant locations where its ION Rewards app users can earn IONs at every checkout and spend them like cash at any time on anything at any ION merchant. This recent surge in merchant locations comes just weeks before the company releases the highly anticipated, fourth generation ION Rewards app on June 15th. TWEET THIS: CLICK HERE #IONs are real-time, instant rewards; no pen