The strategy my SO and I have found works well with our toddler is to find activities to replace the scrolling habit with activities that provide a better model for him (but can still occupy us). We both read paper books around him, under the theory that he can't tell "reading a book on the phone" from "scrolling social media", or do our versions of crafts, or reach out to contact friends and family.

There's a plus side for us as well, since reading, doing hobbies, and being in closer touch with friends is what we would (in our unwarped-by-phone-addiction moments) rather be spending our time doing.