Sending money through e-mail has been gaining popularity of late with innovations from Google, Dwolla, PayPal, Venmo and, most recently, Square. After several months of invitation-only beta testing, Square rolled out a person-to-person payments service, Square Cash, in October 2013. On Aug. 26, 2014, it released an updated version of the service. The update enables users to send or request money from anyone in their address book simply by using their phone number, even if the recipient has not downloaded the app.