The only real limiting factor for Osaifu-Keitai support is a requirement for one of the following to be present on a device: Dedicated Mobile FeliCa chip or NFC SWP support for FeliCa SIM FelicaRf (original, old implementation); Global Platform based Secure Element with FeliCa applet FelicaGp (new implementation). Google Pixel series starting from 4 and 6 have the required FeliCa applet provisione