As an iPhone user, I’ve always been drawn to the reliability and privacy features that Apple offers. For a kid’s emergency phone, I think a simple, durable option like the iPhone SE would be great, or even an Apple Watch with cellular connectivity - it’s easy to use and has a rugged design. If you’re looking for something even more basic, you could consider a flip phone with a simple interface, but I’d recommend exploring Apple’s options first for the added security and ease of use.