[dotancohen]

The wiki has instructions for the N900! Not everything works, but it appears to be a work in progress.

[hexagonwin]

For the N900, Maemo Leste <https://maemo-leste.github.io/> would be a good choice, if not even better.

[sschueller]

Nice, I still have my N900 but my provider here (Swisscom Switzerland) is killing 3G by the end of the year...

[d3Xt3r]

I wonder if there's some sort of GSM hotspot device where it connects to 4G/5G networks, but creates a small localised 2G/3G cell for older phones. Kind of like how we have mobile hotspot devices, but instead of (or addition to) creating a WiF hotspot, they provide 2G/3G...

[dotancohen]

I bet a Stingray could do that. Have any cop friends?