I used work for Symbian. The OS itself was great at the time (it's open sourced somewhere), and got security correct (I don't recall 'privacy' ever being an explicit goal) but it was an absolute bitch to develop for. It had its own dialect of C++ which looks nothing like modern C++, the learning curve was huge. It tried really hard to have an app ecosystem but it was nothing like what google and apple have today. Net…
Symbian was great, and I loved my indestructible all-silver Nokia E61 non-US version (which included WiFi, unlike the carrier-crippled ones I found in the US). https://en.wikipedia.org/wiki/Nokia_E61 I actually looked recently at trying to buy another E61 in good condition, and how much trouble it would be to kludge up access to my email through it. I figured it would be more productive for email than my current main…
That said, it was small, smaller than an iPhone SE. And it had a hardware keyboard. I'm not against fancy apps and stuff on my phone but, besides calling reliability, the first thing I want is to be able to type small things.
I must confess I was unhappy that it even had a touchscreen: a nightmare when it was raining. I guess I just loved the form factor and its promises.
I'm thinking of making this an ode. The E6 ballad. Sorry for that long little-informative comment...