Hi @Alan08,

Thanks for getting in touch.

At the moment Oppo phones are unfortunately not supported by Square. You may find some Oppo devices will incidentally work with Square if they meet certain Android operating requirements, however we can't guarantee any Oppo device will work on an ongoing basis with Square as we continually update the firmware and security in our readers.

For a little more context, Oppo phones run on a heavily modified version of the Android operating system called ColorOS - in most cases Oppo devices and ColorOS won't meet our minimum device security requirements to process card payments and utilize "PIN on Glass" technology to securely process physical card payment on a mobile device. Square will often detect ColorOS as a "rooted device" - you can read more about what this means here.

Sorry we couldn't be of more help! You can view a list of devices tested as compatible with Square here.