My nephew didn't have an smartphone until he was 12-13 I think.
He had a tablet at home and a switch though.
There is a region-wide push to prohibit smartphone usage for primary school children (<12yr)
TCL Flip 2 - https://www.tcl.com/us/en/products/mobile/flip-series/flip-2 ("Access to email, web browser, and popular tools like calendar, calculator, notes and more" and the specs say it has A-GPS).
Nokia 2780 - https://www.hmd.com/en_us/nokia-2780-flip?sku=16WNDR11A01 (note: supports apps via KaiOS, including YouTube, Google Maps, and a web browser; review at https://www.cnet.com/tech/mobile/i-replaced-my-iphone-with-a...)
Nokia 2760 - https://www.hmd.com/en_us/nokia-2760-flip?sku=GPNKN139DCGBB (same note)
I learned about the finder from the paper "Swapping 5G for 3G: Motivations, Experiences, and Implications of Contemporary Dumbphone Adoption" at https://dl.acm.org/doi/pdf/10.1145/3637402 . Its list of "dumbphones" includes this rugged flip-phone:
Sonim XP3plus - https://www.sonimtech.com/products/devices/xp3plus/ . Has GPS/A-GPS, GLONASS, Galileo.
For non-flip phones, the recommender mentions the Punkt MP02, https://www.punkt.ch/en/products/mp02-4g-mobile-phone/ , which includes Signal,
and the Mindful phone, at https://greentouchstore.com/products/mindful-talk-and-text-m... ; the latter is based on Rabbinical Guidance ("Based on their policies the phones will not feature any internet or entertainment apps besides Text message app and Offline Music Player")
In the kosher category is also the Fig Flip II X - https://figkosher.com/products/fig-flip-ii
There's the Light Phone II - https://www.thelightphone.com/ ("a premium, minimal phone. It will never have social media, clickbait news, email, an internet browser, or any other anxiety-inducing infinite feed.")
Mudita Pure, https://mudita.com/products/phones/mudita-pure/ . Uses an e-paper display, designed for low EMF, and includes a meditation timer.