Nokia has introduced some old familiar names as new KaiOS devices. These versions of the 6300 and 8000 have 4G/LTE in 2020, although they look much the same as old-school button phones. There are also features such as FM radios, WhatsApp support and headphone jacks in evidence with these new devices.
https://www.notebookcheck.net/Nokia-launches-the-6300-and-8000-4G-modern-feature-phones-starting-at-US-58.504084.0.html
IDK, but if the phone has a slider keyboard, I'm in there like swimwear! ;D