I also agree with this. I have a Artphone C1 phone for elderly (from aliexpress) as a "landline" in my house for kids and whatever. Week long battery life, docking, cellphone (sim) so im not relying on internet or power to make a call.

Edit: and I can also take it with me as a spare phone.

The ratios (in %) are 75:25, 50:50, 25:75, and 33:33:33.

Why not 33:66?

I second stratum, I think it ticks all your boxes.