I only started using around Android 2.3 time frame, because I held to my trusty Symbian until it died on me, by then Nokia was already showing signs of not being sure what to do after Belle.
Belle already had lots of features that took Android and iPhone years to catch up with.
they had Maemo, they had Symbian. But they were afraid that focusing on Maemo would lead to Symbian dying before they could get Maemo to the same level.
And then boardroom meddling was added, and they went much the same way as HP...
It was done via the desktop application to manage the phone.
However one would ususally only get bug fixes on the Series 30 and 40.
On Symbian towards the end of it, there were some OS updates still, but usually only once.