Privacy through prepaid phones

I’m doing a bit of research on burner phones and it’s hard to get any answers I trust, so I’m turning to the privacy community here… obviously Reddit knows best.

Using cash or a cash bought gift card what is the best option for privacy when it comes to prepaid phones?

Are there any options for a data link? Is there a prepaid smart phone you could hotspot for a true private internet connection?

What things should someone consider? How …

phones privacy