Are user agents created at the time of installation, or does each Android model have its own version of the major browsers?

No and No.

https://user-agents.net/browsers/android
https://myip.ms/view/comp_browsers/8384/Android.html

If you want to change your user agent, then use a web browser that has that function.

If you want to see what your web browser is reporting
https://ipchicken.com/

I am using my own browser right now. And it reports
Because that is where I have it set. So I get smaller/lighter pages.

I use naked browser on the androids I have. It allows for user agent changing.

With javascript enabled in your browser, the site you're visiting can find out much more about your system than what the user agent provides.

And you can't use most sites without it, so they gotcha.

Is there more known than what is available on: https://www.whatismybrowser.com/?

I use browsers in Linux and Android, and I would be happy to get my devices' models out of the user agent.

Are you stating you use a mobile user agent in your desktop browser?

I use builtin Chrome, Opera, and sometimes Firefox on Android and I want the phone's model out of the user agent.

Yes of course. I built a couple of web browsers for myself that do what I want a browser to do.

iPhone

Win 10

Arch Linux

Maybe not as pretty as some, but it does what I want, not wants it wants. As I gain more knowledge on C and C++, perhaps I can do better.

https://0x0.st/orcb.png

What exactly do you mean device model? The device model is not normally in the user agent.

For example my useragent from Firefox on Lineage(Android); no mention of device model:

Mozilla/5.0 (Android 11; Mobile; rv:95.0) Gecko/95.0 Firefox/95.0

I also have an older motorola phone running stock oreo and basically the same but 8.0.0 for version...

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You're right for pc browsers.

My exact phone model is in my Android browsers' user agent.

I'm trying to understand how it got there and how to get it out.

Those little android browsers report what they want. Unless you have one that has a user agent switcher.

Android is all proprietary the way the phone companies and device makers have them. You'll have to get the java source for the browser and look at it. That is if it is available. Otherwise, there is nothing that you can do about it. Some hardware makers like marvel won't even release the instruction set for their processors so that you can build a kernel for one.

Android is google. You can get a ROM and install it in the phone/tablet. That is if you can find one for your device, and your phone company allows it.

Or, use an open source web browser.

https://search.f-droid.org/?q=web+browser&lang=en

https://play.google.com/store/apps/d...er&hl=en&gl=US
https://play.google.com/store/apps/d...hl=en_US&gl=US

https://f-droid.org/en/packages/org....fennec_fdroid/

That search above of Fdroid didn't show Fennec, which is firefox built from source (and signed by fdroid)...

But even firefox from aurora/playstore doesn't include any model number for my android devices. I'm still curious to see what your useragent from firefox/android shows... I pasted mine from two devices above and no device model...

Show us. I've never seen that.