There are a number of companies getting involved in getting mobile phones to be able to make purchases and charge either your mobile phone bill or directly to your bank account.

Google is now planning to launch a new mobile payment service that will be based on Near Field Communication or NFC. This new service would provide the ability for people to make purchases with their mobile phones at retailers. To make a payment for the items being purchased, all a customers would have to do is wave their mobile phone or tap their mobile phone on a device at the register. These in store devices would also have the ability to slide a credit or debit card through them to make the purchase if not making a purchase with your mobile wallet.

via TechInsider.