Yes, and dumbphones exist (again). You can buy a newer version of the Nokia 3210 that charges with USB-C and works on modern cell networks.

The main feature I want for my kids is an explicit allow list to keep them from gettin spam or talking to randoms.

The manual I found doesn't seem to have this feature. Also the advertising page has "Cloud Apps for news, weather, and more" :( https://www.hmd.com/en_int/nokia-3210?sku=1GF025CPD4L02

	▲	eloisant 2 hours ago \| parent [-]
		Yes you should check KaiOS phones for that. Now the problem is that they're not "dumb" enough as they have a web browser, youtube etc, but that can be considered fine because the experience for those is so bad that it's unlikely to get addicting.