>First, because many people will be unaware that this kind of "mature content" censorship is taking place at all, and therefore won't ask for it to be stopped.

You get a huge interstitial page telling you that the site is being blocked and telling you what you need to do to have it turned off.

I agree that the block should be off by default. Sellers could ask the customer if they wanted the block turned on when the phone is bought. I agree that the blocks are too broad.

T-Mobile didn't ask for any ID. I guess I'm pretty obviously over 18. They did ask for my name and address.