Originally Posted by
Lost_Luggage_in_SEA
a) red pocket when I am in the US (runs on the AT&T network): this doesn't work at all outside the US
Red Pocket works using WiFi when outside the US. It can be configured to use a local data sim in an iPhone. I have done both in the UK to prove to a friend he could have a cheap prepaid US number for 2FA for his US banking while living in the UK.
The OP can use Tello the same way when outside the US. Neither has geolocation blocking for WiFi.