Android-based flip phones and feature phones usually do not have a touch screen, and instead rely on the D-pad, soft keys, and number keys for navigation and data entry. And the screen is small. Nevertheless, these can still run some android apps.
When things don’t work, it is usually because the app requires touch tapping or swiping. Sometimes there are user-interface objects which cannot be reached using the direction keys, and sometimes the cursor ends up stuck in a data entry field with no way to get out.
Some phones have a cursor in the browser, allowing the use of many online sites.
There is also a third-party app cursor for some phones, activated by holding a key for a moment. See the mouse app at:
https://www.apps4flip.com/apps/
Some f-droid apps which seem to work with Android-based flip phones and feature phones include:
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The f-droid app itself: On my phone all I had to do was click on it in the browser at the f-droid.org home page. What works are Latest, Updates, search, install, open, remove. What does not work is Categories, where I am not able to scroll down to see more categories. Once a category is selected it works fine.
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Planisphere: Astronomy. Fully operational, if a bit challenging in the small screen.
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The Light: Bible. Works fine, unlike its bigger sibling The Life.
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tower: Can show a map of what is nearby, including zoom in and out.
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OSM Tracker for Android: Tracks your movement on a map. Seems to work.
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SecScanQR: QR code reader. Displays the result and allows you to send it to the browser.
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AdAway: Ad blocker. My phone allows a local VPN, so AdAway works with its default settings, without root access.
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NewPipe: Plays YouTube, SoundCloud, etc. Some limitations with the user interface, but I was able to get it to work well with the phone’s media player. Some resolutions do not include audio, but 360 works well enough and is more than sufficient for the small screen.
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Sokoban: Game. There is a (g) version, and I forget which version I have. Perhaps they both work.
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MSnake: Game. Warned that it was made for an old version of Android, but does work on this new phone.
Please add to the list any others you come across.
There are many which could work with just a few changes. I may submit some feature requests / bug reports where possible.
If someone knows of a website showing how to develop key handling and navigation for Android flip phones and feature phones, please add it here so other developers can quickly adjust their apps.