Hi amoun,
thanks for the reply and the warm welcome! 
Thank you a especially for your perspective on the threats and also on how you deal with them. I am aware of cell phones being less secure than computers and that mobile banking and mailing via the phone exposes my data to a certain risks. What I am not sure about and would like to know more about are the specific risks of using the Android 4.4.4 for the Fairphone 1. Concretely:
- Are there known security lacks of this Android version that hackers or viruses could use easily, maybe even with openly available instructions?
- And also: Are the persons that made Android 4.4.4 available for the Fairphone 1 still working on updates or is this a not-anymore-updated version? If there are still persons working on it, I would love to contribute and offer my skills but would probably need some instructions.
If anybody knows about these questions I would be very happy to hear about that!
Greetings,
Adrian
PS: Yes, it’s still working fine for me to use the Fairphone 1. Althourgh I am just starting to use it again and meanwhile also using the Fairphone 2 which I am thinking about to give up again for the Fairphone 1. So far, I am succesfully using these services on the Fairphone 1:
- mailing (Librem Mail)
- SMS, encrypted (Silence)
- navigation, offline (OSMand)
- messanging (XMPP, matrix, signal, telegram)
… and I am still working on streaming. Qobuz has an app for Android 4.4 but the download function does not yet work perfectly and the streaming is not fast enough. This is because the Fairphone 1 does only support 3G and the infrastructure for that is not available anymore in the places I am around.