You might not have heard of Monzo in the US, but there's a good chance your British friends have when the digital bank has racked up over 2 million customers in its short history. And now, it's coming to the US... in a manner of speaking. Monzo has unveiled plans to roll out service to the US in the "next few months," including the mobile app and a Mastercard debit card. It'll build the audience slowly by connecting with hundreds of people at a time at events before it conducts a wider-scale launch. However, don't expect it to function as a bank at first. It'll be closer to a money transfer service akin to Venmo or Apple Pay Cash.