Earlier quoted context omitted.
The nice thing about using an MVNO (aside from cost reduction) is that the carrier never receives any of that PII. I like the Red Pocket plans on Ebay, and they never asked for an SSN.
How are MVNOs able to offer a lower price than the carriers? I was interested but didn't switch because I was worried they are selling my info or something.
And in reverse, better brand recognition/(impression of) service quality allows the network operators to charge more and still get customers, the MVNOs need to be cheaper to compete with that.