Grab yourself a Satellite phone, done.
I tried ubuntu touch. Not having any banking app was a pain. I was not successful in using signal. WhatsApp is also very used around me. So I gave up.
I wanted to degoogle so I tried iOS. It is absolute garbage.
I think /e/OS, GrapheneOS and CalyxOs are the best to use right now. I might buy a fairphone with /e/OS despite the price when I will change phone, because I do not want to buy a pixel
Honestly can’t find anything but iOS that is workable for my use case. Sadly
Well, apart from the fact that it’s NOT Google, (which I used for over a decade), the big selling point for a small business person is EMAIL. Apple do a good job of Email/Contacts/Calendar/File whereas Android struggles. Try accessing a third party Exchange email account on Android … yikes!
iCloud offers cheap reliable multi domain email hosting and the iOS Mail client sucks less than any other mobile email clients, at least in my experience.
I perceive Apple as, at least, a little more respectful of my privacy than Alphabet which is up there with Meta in profligate privacy abuse.
Another consideration is I can rely on Apple to keep incrementally improving devises/OS’s whereas Alphabet has become much less reliable in terms of introducing services then capriciously terminating those services. Every Android handset is a bespoke experience…
I use Linux (Debian Stable) on my desktop & BSD on my Servers.
I would love to use a mobile device running an open source OS such as Linux, it’s not viable yet.
I tried SailfishOS, gave it about 5 years but in the end a combination of bad hardware options and small user base (leading to small number of high quality apps) led me back to Android (grapheneOS).
I was using two other systems in the past before giving up and using Android. The first was Meego by Nokia and Intel, on the Nokia N9. This is not an option anymore since Nokia switched to Windows Phone and then stopped altogether (current Nokia brand not being the same company). The second was Sailfish OS by Jolla. It can still be installed on some older Xperia phones and is a viable option. Though the development could not keep up with iOS / Android. There is some Android app compatibility. For a while I thought KaiOS might become an option, if scaled up a bit, becoming more feature rich. But I think cheap Android phones with Android One have taken that niche now.