The 9575 is smaller, lighter and has been designed to military grade specifications for durability. This phone also provides a GPS component which can be integrated with an LBS portal for online tracking and monitoring. The most noticeable difference is the Programmable SOS Button. This red button is located on the top of the phone, under a protective cover. By removing the cover and pressing the red button you can send your location information to your designated contact in the event of an emergency.