Step one...
Don't get mobile on contract.
Step 2. Buy phone from out of town anonymously or lie.
Step 3. Buy SIM anonymously or lie from out of town.
Step 4. Never leave switched on in a 4+(paranoia dependent) mile radius of home.
Step 5. Buy top-ups with cash.
As one is always tracked by the telco, and this can not be avoided, the data collected this way provides some anonymity. Do you need to be that anonymous? The problem lies with the data getting into the wrong hands, and most hands that aren't your own are the wrong hands.
The tracking Apple proposes is easy to avoid. Switch of the feature and if one can't, get a phone on which one can.
For a (n informed) consumer there is choice. And readers, as many of you are IT professionals, this shouldn't be a problem. It depends on how deeply one feels for the uninformed sheep I suppose....Bear in mind that their consumption, just like mine supports very rich people and keeps wage slaves in work.