I have used a lot of smartphones with keyboards in the last 20 years or so. I think it started with a Palm Treo 600[0] and on top of my head I've used plenty of others (in not the right order): HTC Blue Angel[1], Sierra Wireless Voq[2], Nokia Communicator E90[3], Motorola Milestone[4], Motorola Droid 4[5] (where I had to solder the SIM-Card into the phone to use it in Europe), Nokia E71[6] Nokia E75[7], Nokia N900[8] (running Debian on some point), BlackBerry Curve[9], BlackBerry Bold[10], BlackBerry Q5[11], HTC Dream[12] and I probably even forgot some.

I really loved the latest Nokia pones with Symbian S60 as long as it worked. Working browser (Opera Mini), GPS navigation, Emails, Calendar and Contact syncing (via ActiveX I think) and everything with a week long stand-by time.

I would love a recent Android phone with a small form factor, full QWERTZ keyboard (preferabbaly slide-out) and decent camera. But I think the BlackBerry Key2 is the most recent smartphone with a physical keyboard and unfortunately it doesn't get any software updates. Right now I just hate typing on my phone and most of the time I wait until I am at a computer before I respond to any texts or mails I get on my phone.

0: https://en.wikipedia.org/wiki/Treo_600

1: https://en.wikipedia.org/wiki/HTC_Blue_Angel

2: https://en.wikipedia.org/wiki/Sierra_Wireless_Voq

3: https://en.wikipedia.org/wiki/Nokia_E90_Communicator

4: https://en.wikipedia.org/wiki/Motorola_Droid

5: https://en.wikipedia.org/wiki/Droid_4

6: https://en.wikipedia.org/wiki/Nokia_E71

7: https://en.wikipedia.org/wiki/Nokia_E75

8: https://en.wikipedia.org/wiki/Nokia_N900

9: https://en.wikipedia.org/wiki/BlackBerry_Curve

10: https://en.wikipedia.org/wiki/BlackBerry_Bold

11: https://en.wikipedia.org/wiki/BlackBerry_Q5

13: https://en.wikipedia.org/wiki/HTC_Dream