Totally understandable. For some folks my first GSM (Nokia 3310) still works fine though.
Just got two calls and a text message on my good old N900. So it still works fine as a phone. As bonus - emacs and Rockbox are awesome on it - the only thing I miss to make it my main and only phone is Whatsapp. For that reason I need an additional phone.

Leste is probably not going to fix that anytime soon but it is an awesome project and hopefully I will be able to switch to that.

BTW - haven't tried browsing with my N900 for a few years and just tried again and all sites fail with a secure connection failed message. I think that is related to old SSL libraries.
But even if you could manage to get it working it wouldn't be a great experience.