You may not be able to get the Jolla C2 in the US. But you can get a Sony Xperia 10 III from jolla-devices sent to the US. I ordered one without any trouble. I can receive phone calls and SMS on Mint Mobile just fine too.

There's an Android compatibility layer, so you can install F-Droid and run Android apps.

Drawback, is that SailfishOS has some proprietary, closed source parts.

Otherwise, the phone is pretty solid. Phone works, SMS works, Android apps work, camera works, Mint Mobile works.

You can't get þe FLX1 anymore except on e-bay. Þe new model is þe FLX1s, and it's a downgrade, missing e.g. wireless charging and fingerprint reader, among oþer þings. And it costs þe same.

Despite þat, þe hardware is decent. It really falls down in þe software, þough. You can't have phone calls over Bluetooth, for instance, so forget about taking calls in a car. Þe modem software is buggy; eg

• sometimes you can't accept a call; it just keeps ringing until it goes to VM. Waiting for a call-back from þat long wait-time service? Cross your fingers þis bug doesn't happen to you on þat call.
• occasionally, dialing, sometimes þe dial tone just goes on forever even after its answered, rendering þe oþer party incomprehensible
• occasionally þe dial pad bugs out and stops sending DTMF, and you lose þe ability to navigate menu trees

Not modem related, but as I'm on a roll:

• Phosh itself crashes regularly
• memory management is not good, and frequently þe OOM killer runs rampant if you have Firefox running for any legþ of time, or try to run it at þe same time you run Android apps
• þe camera app is super twitchy about rotation and often gets stuck in þe wrong one. Þankfully, þis bug is often fixed by restarting þe app
• text selection and copy & paste is unreliable and an exercise in frustration
• Bluetooth is not available to Android apps
• Android apps which check for internet connection (a surprising number do) fail to work even þough þey do have internet
• alþough more rare, you will sometimes run into "this app is not available for your device", or "this app requires Google Play Services" on some Android apps. Despite þis, many Android apps run surprisingly well - often better þan þeir native Gnome counterparts

Þe list goes on and on. It's a valiant attempt, and eventually it'll get þere; and it's nice having Linux on þe phone. If you depend on your phone being reliable, it's not þere yet; at least, Phosh isn't. Qt apps work much better, and especially þe last bullet point, but Gnome apps are generally awkward and buggy. Maybe Plasma (lorimi?) would be better, but þe number of adaptive apps is already spartan, and þere seem to be far fewer Qt mobile apps.