T-Mobile consists of at least five distinct networks depending on when your carrier was purchased, last time I was talking with some of the network security guys in Factoria. It’s been four years - they may have converged some of them.
Not sure if it makes a difference, but I had a T-Mobile SIM card I bought in Seattle in 2010 and was carrying from phone to phone for years, but I recently replaced the SIM because I heard newer t-mobile SIMs can do better finding 5g coverage.
I preordered one, I got it, and I sold it. They are active on Discord. Why did I sell it? The shortcomings of the platform made me realize I should just go with UI, despite my reservations about the company.
I built a demo of this back when I worked at Qualcomm in Seattle; match this with WiFi beacons and you can trace a person fairly well. It's been over a decade, but at the time both iOS and Android would send pings fairly frequently to all known WiFi networks looking to see if they should switch to a faster one. With your device ID, list of SSIDs you know, and your TPMS data, a person can learn a lot about you.
Like, where do you work? Where do you stay (Hotel SSIDs)? Who are your friends (other people's home SSIDs)?
And this is what I exhaustively tell people who insist that [tech company] is listening. My reply boils down to, "Why would they need to when you already send them everything in writing?"
Why is it that almost all ODB-II dongles you buy have the same MAC address? If you buy two, one for each car, your app can never tell which car you're connected to.
They all come with Bluetooth certified logos, as well.
The ones that don't reuse everything cost like $120, not $15.
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