If there is any continuity to your phone usage, then that is you as an individual that is being tracked. That's what it means for a person to have an identity:

If there is any continuity to your phone usage, then that is you as an individual that is being tracked. That's what it means for a person to have an identity: continuity in behavior patterns. It's safe to assume those several dozen people don't share your phone. And even if they did, that's a level of familiarity that means you are among a group of people that probably operate as an economic unit. Nobody is stealing you identity here: they are assigning you one.