Just spotted this thread. My N900's retired now, on my 2nd one (first died of what seems to be storage failure? Reflash doesn't help) which still works. My current phone's a Droid 4 running LineageOS 14.1, I took it to the US back in mid-October and it wouldn't pick up a cell signal after working in multiple other countries! Turned out it has a region-specific hardware cell network lock in the US, so I would've had to get a Verizon SIM to make it work. Luckily I'd accidentally packed my N900 in my "phone stuff" pouch so I used it for calls & texts for the week.