Smartphones. I kept refusing to waste such amount of money for a phone, when I could make and receive calls and send and receive text (SMS) with my trusted all GMS phones (had a few of them).

For everything else I had computers, desktops, laptops, and servers, which were most of the time within my reach.

I finally capitulated and got my first Android phone when I decided I wanted to be able to have a bitcoin wallet on my pocket. Had been using localbitcoins by SMS for a while already. :-)