Going mobile with money. This simple, yet powerful idea behind Obopay lets you receive, send and spend money right from the convenience of your mobile phone. The company offers the most comprehensive mobile payment service in the United States. Obopay has relationships with banks, payment cards, carriers and handset makers firmly in place. With over 200 million cell phone users in the U.S. and more than 24 million MasterCard acceptance locations worldwide including merchants and ATMs, a lot of people and places are going to be using Obopay.