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If you want, you can use PayPal, where most of us probably already have an account whether we like it or not. I suggest also checking out Square Cash, though. It’s a very easy process that allows you to get set up with nothing more than an email address and your ATM card. They have apps for both Android and iOS. There is also Venmo, but I haven’t use that service so I can’t comment one way or another about it.