Square Point of Sale does not currently support multitasking. This means that payment processing may be interrupted by an incoming call or text message.
We recognize that multitasking is a popular function of mobile devices, and we are working to incorporate this feature into our app. In the meantime, it’s easy to ensure that your payment successfully completes.
Keep in mind, if you are running other apps on your device, you can switch back and forth between the Square Point of Sale App without having to sign in again.