After finally getting a SIM insert I was able to activati ESIM, once it rebooted with a SIM inserted. Then the Planet root image allowed me to restore everything without having an unlocked bootloader. I'm not using it as main device yet, but I use it a lot now. I generally have both the Cosmo and the Gemini with me, Cosmo in my pocket, Gemini in my bag. As I had the Gemini the behaviour change back to how I was using the N900 after a few years of non-keyboard phones happened already with the Gemini.
Initially I liked the Cosmo keyboard less than the Geminis, but after using it a while I quite like it.
Annoyances compared to the Gemini are:
- worse battery life
- worse touchscreen response. Got better after increasing pointer sensitivity, but still registers zero events when placed on a surface and not touching the frame while touching the screen
- app switcher doesn't have app screenshots, only blank or transparent frames
- automatic rotation is not working, even with additional software
- no SIM card in the rooted boot image (unless going the unlock bootloader + patch boot image route). Not a big issue currently as I initially needed root to restore, and currently can use the non-rooted image, but for daily use I'd like it rooted. Also losing some settings (like backlight) when switching between the images.
- orientation matters when in call - speaker/microphone don't adjust with orientation changes
- worse notifications. In theory cover display should be able to get better notifications, but it doesn't really. I generally care about having the type of notification displayed, configuring the 5 LEDs on the Gemini with different colours was perfect for this.
Better:
- more memory, both flash and RAM. Especially RAM was an issue on Gemini
- screen is usable with polarized sunglasses, in both orientations. On the Gemini display was only readable in portrait
- backlit keyboard
- significantly stronger hinges