Oh, you mean the ones that come with spyware preinstalled?

https://www.zdnet.com/article/unremovable-malware-found-prei...

It is irrelevant if they have a touchscreen or are 'cheap second hand', it has a processor and it runs software.

You want dumb phones, use analogue ones that plug into a socket with a rotary dial and use a paper map for navigation.