Please post here if you know ways to use user scripts on mobile smart phones.
Confirmed working setups
Android
-
Kiwi browser can install all extensions from the Chrome store, including Violentmonkey* and Stylus
More details (Violentmonkey and Stylus)
It is the new reference for user scripts and user styles on Android. Itâs ultra fast, even with tons of huge scripts!
* Tampermonkey should also work
Additional cool stuff when editing MB:- Link context menu (long touch): Copy link text
- Link context menu (long touch): Open in tab group
- Does not pause scripts in background tab
Additional cool stuff when debugging userscripts:
- Complete DevTools
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Firefox finally supports Violentmonkey and Stylus (and Tampermonkey), now again!!
More details (Violentmonkey and Stylus)
More details (Tampermonkey)
iOS
Untested, I donât have an iPhone. Please someone interested and with an iPhone correct this:
- iOS 14+
- iOS 15.1+
Windows Mobile 
None yet.
I think Microsoft completely abandoned their mobile OS.