First time I spotted this forum post on GOL. I have been testing and using a multitude of degoogled and Linux phones over the years, and I can advise on what works and what has issues.

My Linux PDA experiences kicked off with the Sharp Zaurus devices. I tinkered with Palm Treo smartphones, and early Symbian smartphones (e.g. Sendo X) and many more besides.

The decent Linux phones were released by Nokia - and I own the N900 and the N9 by them. The N900 runs Maemo Linux, the N9 runs Meego Linux. Steve Elop messed up Nokia company just as these Linux phones were kicking off, and they were awesome compared to Apple and Android smartphones at the time. Nokia stopped developing them further. Nokia fractured some developers who went away and formed Jolla company. Jolla releases SailfishOS Linux for some in-house mobiles, but also for a selection of Sony Xperia phones.

For SailfishOS, you can use Xperia 10, Xperia 10 ii, Xperia 10 iii, Xperia XA2 Android phones and overwrite with SailfishOS. The Xperia 10 iii is the one to go for, because more hardware (e.g. camera) works on it. Avoid the Xperia 10 v because camera doesn't work (yet) and hasn't for the past 2 years. SailfishOS has quite bad battery drain on the Xperia 10 iii (and others) because it doesn't handle idling the cellular modem as well as Android OSes do. I tested drain to be approx 4.5% battery capacity per hour, versus 1% drain for degoogled LineageOS Android. As soon as the cellular modem isn't used i.e. If you put into Flight Mode or use the phone without a SIM, the problem goes away and it can last a long time on battery.

I find SailfishOS to be fairly polished and pleasant to use, with good selection of Jolla company default Apps as well as plenty of community Linux Apps. Additionally, if you pay Jolla for the OS license (you can use the OS without a paid licence) then you get Android App support added. I find that SailfishOS with Community (Linux) Apps can handle most smartphone needs (play music, browse web, photos, image gallery, torch, document viewer, Linux console, play videos, GPS navigation, basic games, password manager, etc) WITHOUT needing Android Apps to compensate.

In terms of other Linux Mobile OSes - These are available: Droidian (Debian based), Mobian (Debian based), Ubuntu Touch (community Linux, not controlled by Ubuntu company), PostmarketOS, (SailfishOS), probably a couple more.

I particularly like Droidian, and it is very close to Daily Driver status. With Droidian you can easily enable Waydroid which gives you a convenient way to access Android Apps. Droidian gives you a convenient toggle to switch Waydroid on or off, so you can ensure pesky apps are not running without your permission. The main drawback of Droidian is the lack of a good selection of mobile Linux Apps (i.e. where SailfishOS excels). The other problem is that cellular modem idling battery drain (which affects nearly ALL Linux mobile phones). I don't want to run a phone I have to charge DAILY, when it would last 5 days on battery running LineageOS (degoogled Android).

Ubuntu Touch is pretty decent too, and you can get Waydroid running on that (and then Android Apps work too).

In each case, you need to find a suitable phone, you need to ensure that features of the phone work on your chosen OS (or you have to manage without them). For instance, Linux OS on one phone might not support the fingerprint scanner, on another phone the camera might not work, etc. I like to choose a phone which is supported by *multiple* OSes - and I have a recommendation to share:

Get a secondhand Pixel 3A phone, and you can run LineageOS, PostmarketOS, Droidian, Ubuntu Touch, e/OS, and other OSes on it. The Pixel 3A doesn't have the battery problem plaguing the Pixel 4A (and higher).

Quoting: g000hSailfishOS has quite bad battery drain on the Xperia 10 iii (and others) because it doesn't handle idling the cellular modem as well as Android OSes do. I tested drain to be approx 4.5% battery capacity per hour, versus 1% drain for degoogled LineageOS Android.

Your information must be outdated, or there must have been something else going on. I've been using my 10 III for a couple of years now, and it's never been that bad. I lose just slightly over 1% per hour when the device is idle. Same with my wife's identical phone. Drain was similar on my old, first-gen Xperia 10.

Get a secondhand Pixel 3A phone

I'm surprised Pixel 3 / OnePlus 6 phones are after all the years still the gold standard for non android linux on a phone.

Although %1 per hour is manageable (with LTE on, right??) I'd panic over that because my regular android phone can use below %1 per hour, I'd say %1 per 2 or 3 hours with cellular on, way less with Wi-Fi on and cellular off but still with cellular signal. I'd worry the %1 per hour may became %2, %3 in a few months. Not sure how realistic my concern is.

Quoting: tuubi

Quoting: g000hSailfishOS has quite bad battery drain on the Xperia 10 iii (and others) because it doesn't handle idling the cellular modem as well as Android OSes do. I tested drain to be approx 4.5% battery capacity per hour, versus 1% drain for degoogled LineageOS Android.

Your information must be outdated, or there must have been something else going on. I've been using my 10 III for a couple of years now, and it's never been that bad. I lose just slightly over 1% per hour when the device is idle. Same with my wife's identical phone. Drain was similar on my old, first-gen Xperia 10.

Rather than imply that *I* must be wrong, consider that it could be a number of possible things, including potentially that you are mistaken. I did these tests *recently* using the latest available SailfishOS 'Linux' (compared with the latest LineageOS 'Android') on the exact same device, using the exact same SIM card - and in my country I am forced to use the 4G or 5G network, because 3G network has been switched off.

There might be other reasons (i.e. you're still on 3G) why your phone behaves differently. Aside from comparing SailfishOS to LineageOS on the Xperia 10 iii, I have done similar battery drain tests on other phone models and practically every Linux mobile OS suffers fast battery drain on cellular compared with Android. I've done this testing multiple times on multiple different phones.

Anyway, saying all that I guess I will go away and test some more (because you can never do enough testing).