Necuno

The Necuno is a phone-like mobile device from Finland, where it is also exclusively manufactured. It seeks to provide a high level security and user privacy by omitting the cellular modem, thus not being able to use the regular mobile phone network, instead offering VOIP via a peer-to-peer encrypted communications platform called Ciphra. However, standard cellular connectivity is planned for later versions. The Necuno is mostly open-source, apart from an isolated firmware blob without access to the main memory, used in the Wi-fi driver for regulatory reasons. The device uses Plasma Mobile by default, but can run a variety of open-source mobile operating systems. 
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Unusually for a phone-like device, the Necuno has an ethernet port.