WiFi calling has been supported on every Android (Samsung, Google and Motorola) I’ve thrown at Tello’s SIM, however, as with any service provider, Tello cannot and does not guarantee WiFi calling works on every Android phone model.
Sadly, I need to amend this review with regard to WiFi calling. A few days ago I reported the household Moto G Pure had received an update to Android 12.
It seems said update broke WiFi calling with Tello’s SIM. WiFi calling with Tello’s SIM works on a household 2022 Moto G Power still on Android 11.
Such is the nature of relying on carrier WiFi calling. When relying on WiFi calling infrastructure provided by the cellular carrier partner, the phenomenon of WiFi calling suddenly no longer working is not limited to the combination of legacy RW My Choice SIMs and Motorola phones. It can and does happen with others as well. RW’s proprietary technology had its caveats but also had the virtue of not relying on the cellular carrier partner’s infrastructure.
Tello’s mobile app (which incorporates a VoIP dialer) partially mitigates the issue as one may use that to make outbound calls on WiFi. Tello’s mobile app, however, does not receive calls.