[swiley]

There's no way to build apps locally on most smartphones which are the majority of end user devices.

Open source practically died with personal computers.

[michaelmrose]

When did personal computers die? Most desktops and laptops are fairly open and although android phones are not as open you can build software on your laptop/desktop for usage on your phone.

You could also use something like pinephone or librem. You wont have access to a lot of android tech but the most important functionality. A web browser, sending sms, email, making calls all work.

[spindle]

I agree. Currently not many people use open source on their phones, but that could change, and things like F-Droid are ready to be used.