Mobile payments are often viewed as a replacement for cash and cards. Why carry layers of bills and plastic in your wallet when you can simply make purchases with your phone? But without universal acceptance, the reality is that there are places where swiping your phone isn't an option. Sometimes even a card won't do. You need cash. And what do you need to get cash from the ATM? A card. Great.

For Bank of America customers, that situation is about to change. At Google I/O, the company showed off the ability to withdraw cash from ATMs using Android Pay. All you have to do is look for the contactless symbol near the card reader, place your phone near it, and wait for the machine to respond. It should then prompt you for your PIN as if you swiped your card.

Bank of America isn't the only financial institution working on contactless payments. Competitors such as Wells Fargo and Chase have plans in the work as well.

The feature is already live in around 650 Bank of America ATMs in the San Francisco Bay Area. The company plans roll out support in 2,400 ATMs across the country by the end of this month, with a goal of 5,000 before year's end. With 16,000 ATMs to manage, you won't be able to use your phone at all of the bank's machines, but this is quite the start.

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