First of all, congratulations, when you get Bruce Schneier to endorse your work, you have probably done something interesting.

But still the article is not very clear on technical details. Of course on initial contacts your phone has to provide information about your service provider (they will somehow have to pay for your communications) and it has also has to have some form of identification about your phone (so that the service provider can decide if they want to pay for it). If I understand it correctly, normally this identification is the IMSI, which is normally constant for your phone. From the article it is not clear if you are proposing to generate multiple IMSI's for a phone or using other types of information in the protocols.

Do you have some links to a more technical explanation of PGPP?