In a previous post I was delighted to report that assisted GPS (A-GPS) has become fast enough so I no longer have to rely on Google's Wi-Fi location service that in return requires me to send Wi-Fi and location data back to Google periodically. Unfortunately it turns out that the A-GPS implementation of one of my Android smartphones sends the ID of my SIM card (the IMSI) to the A-GPS server. From a technical point of view absolutely unnecessary and...