The Iridium 9555 is the most economical Iridium satellite phone. Though it does not have built-in GPS features or an emergency S.O.S. button like the Iridium 9575 EXTREME, the Iridium 9555 offers the same global coverage and the same quality of voice, 2400 bps data, and SMS messaging. It weighs only 9.4 oz and has a robust stowed antenna design. The Iridium 9555 comes standard with a 4-hour talk time battery. Other features of the Iridium 9555 include an integrated speakerphone, email-to-text capability, a Mini-USB data port and an intuitive user interface. If you need email capability from a PC, Macintosh, iPhone, iPad or Android device, there is an optional AxcessPoint WiFi hotspot device. An email account is included with the AxcessPoint.