You might want to consider setting up a VPN tunnel to your own network. Main benefit is that you can access your home network as if you were connected to it locally. Which makes switching between mobile data and WiFi a non-issue.
This requires some sort of VPN server and usually a single port-forwarding rule for the protocol which your VPN software of choice uses. For the simplest default configuration of OpenVPN this means setting UDP port 1194 to point to your OpenVPN server.
Generally, keeping things simple, there’s two types of VPN you can set up:
- split tunnel VPN, which gives you access to your home network but accesses the internet directly.
- full tunnel VPN, which sends all of your traffic through your home router.
It is a little more complicated than that, and there’s more nuance to it, such as wether to user your own DNS server or not, but all that is best left to some further reading.
I’ve setup an OpenVPN server myself, wich is open source and completely free to mess around with. (Save for maybe some costs for registring your own domain or DDNS serviced. Those are all optional though, and mainly provide convienience and continuity benefits. You can definitely just setup a VPN server and connect with your external IP adress)
I hate the fact that none of the big names support CalDAV natively. DAVx5 is cool and all, but app developers really need to step up their shit and support CalDAV already. Not just Microsoft Exchange and Google Calendar but CalDAV as well. It’s not like they need to rebuild their apps from scratch.
At this point you might just be better served using a web app instead of a native mobile app. Maybe K-9 Mail transformation into Thunderbird Mobile might bring some good news, but I’m not holding high hopes.
Maybe we should, under the EU’s DMA, force anyone that bundles a calendar/note app with their phone OS to support CalDAV as well as any proprietary protocol of their choice.