Only available in Europe apparently, I was sure I saw this first on the core, but a search did not find it.
One of the draws for me is the replaceable battery. On a long trip, replacing the battery would be golden.
I think its a bit too big, the camera gets a bit of a slating (Probably OK for me) and I tend to enjoy waterproof phones, which will be difficult being modular.
https://www.fairphone.com/en/
I've been drooling over the Fairphone for awhile. Unfortunately we can't get it in the US.
The nearest thing in the US is the Teracube 2e. The Teracube comes with a 4 year warranty and is designed specifically to be repairable: replace battery and screen, but I'm not sure how modular it is. It uses a lot of recycled plastics, soy ink, minimal carbon footprint, etc. Teracube comes in 2 flavors.
1. Standard. This has regular Android on it. So Google will know when you go to the loo.
https://myteracube.com/pages/teracube-2e
2. /e/ Foundation version. Same brand new Teracube 2e, full 4 year warranty, but the completely de-Googled /e/ operating system is installed at the factory. In fact this is the only official /e/ phone available in the US. Works on T-Mobile and ATT networks only.
https://esolutions.shop/shop/murena-teracube-2e-emerald-na/
It appears both versions are available also in CA, EU, UK.
I like the replaceable battery and the price.