Yes. Technically someone can fork the OS and flash it on the Mudita hardware and make the OS communicate online with servers, apps, etc.
It would take time and resources, but it’s technically possible.
No. SAR has to do with how much radiation the phone produces. This does not affect the type of connectivity of the phone, in this case Mudita uses an LTE modem so it can connect voice and text messages via the LTE bands of your local carrier.
The reason why the phone cannot use data to do the functions you mentioned above is because Mudita OS is intentionally offline. They designed the OS to be offline and to not have extra capabilities that need data such as streaming services, social media, instant messengers, maps, etc.
The phone is intended to be a limited device only with offline tools and that’s it. Can Mudita make the phone an online OS? Yes. But that’s not what they made the device for. So most likely they will make a phone in the future that’s more online, but the Pure is intended to be offline only.
Again, if you are looking for the connected features, you can find other devices that would meet your needs (check the Dumbphone finder on my website) or you could fork the OS, modify it to your liking, build the infrastructure, and then flash onto the Mudita.
Even if someone was willing to do this from the open source code and do it under the same branch without forking, Mudita would have to approve it for all devices. This is something that they may decide to think about, but as of right now the phone is offline and it remains to be offline for the foreseeable future.
I personally like that the Mudita is offline and I know many others do too. It’s in its own niche, a proper basic phone without any extras and just the basics most people need.