Comment by pmontra
2 days ago
A relative of mine had a Windows Phone and kept it running at least until the mid 10s. It was fast but he could basically only do calls and SMSes with it because nobody wrote apps for that OS. Everybody in app development (devs and their customers) was keen to see Windows Phone die quickly so they could spare time and money and develop only for two OSes.
WhatsApp supported windows phone through 2019.
Thy were really great on supporting a bunch of less popular platforms (feature phones and the like) WhatsApp supported Blackberry for a long time. WhatsApp probably supported a potato for quite a long time.