The E71 was a god tier device. Owned one for a good bit as a teen and it was the perfect phone for that time IMO. You could even WhatsApp on it until relatively recently.

Yep! E71, E72, and E6 were some of my most loved phones. My love of that form factor meant that my first foray into Android was the HTC ChaCha - that was a mistake.

I had a Qtek 8300 running Windows Mobile 5.0, it really felt like a computing device before smart phones appeared.

It was slow and buggy, but it felt like a handheld computer.

Qtek rebranded to HTC and I bought a HTC Touch running Windows Mobile 6.0, I am not sure when or what I switched to afterwards, maybe an Android.

Oh man qtek flashbacks. I had a 5050, great device but good lord the battery life ducked as soon as you connected to anything (and it only had mobile data, no WiFi, unless you put in an sd expansion card). No more battery? Then your data gets wiped

100% agreed, my first smart phone and I still miss some features to this day. Really great. Shame no one makes a physical keyboard attachment or a follow up Blackberry device.

Almost the exact same situation for me except it was the E61. I remember playing DOOM on it for the first time and being quite impressed.

IIRC the whole common HW platform of late model E-series Symbian phones from Nokia was code named BB. Both E61 and E91 call themselves (IIRC) "BB v5.0" in USB descriptors.