Use a second phone number.

It can keep your real number from getting tied to every loyalty program, checkout page, app signup, and quote form you touch.

Incognito mode won’t stop these matching systems, and clearing cookies won’t erase a graph entry once your number has been linked.

A separate number for lower-trust situations does something more useful:

it reduces how much behavioral data gets attached to your real identity in the first place.

Google Voice can work as a starting point. A cheap prepaid SIM is a stronger, more robust tactic.

That’s a high privacy ROI move that doesn’t require changing your whole life.