Do people really not use it? I use my iPad cellular all the time. Constantly.

One of these days I'm going to buy one of those old MS Surfaces with cellular and stick Linux on it. But for the installation/drivers hassles I'd have already done so.

Fun fact, I once bought a reconditionned laptop and the sim card of the previous owner was still on the slot. More interestingly I could use it to connect to the mobile network for at least 2 years without even knowing the PIN (and having reinstalled to linux).