I've never seen this before. WiFi with a SIM? How does that work? What standard is that? How does my phone know about it? I can't find anything on it online.
@sj I believe comcast has a thing set up where if you use a comcast access point/router/modem combo for your connection it hosts an invisible public WiFi hotspot that people with some app and/or comcast cellular can connect to; maybe this is similar but via at&t instead.
@nytpu I am just shocked that even though I have installed no apps from AT&T and just put a SIM in, it's still able to do this.
@sj Just a theory... Like most ISPs, ATT provides routers with Wi-Fi. But it allows guest access to other ATT customers. In order to verify you're a legitimate ATT customer, you authenticate with your SIM data.
It seems everyone has a way to share their Wi-Fi now. Authenticating with a SIM makes some sense.
At least that's my theory.
@ericphelps I agree, but what protocols they use, how the information is stored on the SIM, what other SIM capabilities have we not heard of, where's this documented, can I set up my own and how...