Phones may soon allow you to transfer or pay money instantly from any bank account or credit line. The potential is great for small businesses and individuals who can't accept credit cards or those who prefer an electronic payment to cash or checks. Paypal is leading the way with a mobile service tied to its already robust online payment options. The technology is available now for these services, but with so many institutions involved (including banks, stores and carriers), mainstream adoption has been slow. See How Cellular Electronic Payments Work to learn more.