As of December 1, 2015, sales of the INMARSAT IsatPhone Pro (TM) handset have been discontinued. Customers who are currently using the handset may continue to use it. Maintenance support for the handset is scheduled to continue until October 2019. The INMARSAT IsatPhone 2 is available as a successor model.
IsatPhone Pro (TM) is the first global satellite mobile phone provided by INMARSAT. In addition to voice calls, IsatPhone Pro (TM) can be used for short text messages, E-mail, and GPS location information.
Battery life is the longest among the satellite mobile phones sold by KDDI, providing up to 8 hours of talk time and up to 100 hours of standby time. The phone also features a large, high-visibility color LCD screen and a large keypad for easy dialing even when wearing gloves.
This service is not provided to individual customers.
Diagram of INMARSAT IsatPhone Pro (TM) network
INMARSAT services are available with INMARSAT satellite mobile phones.
INMARSAT IsatPhone Pro (TM) satellite mobile phone
170 (H) x 54 (W) x 39 (D) mm
Continuous standby time 
Up to 100 hours
Continuous talk time 
Up to 8 hours
·IsatPhone Pro(TM) handset (with SIM card installed)
·Three types of chargers (four types of AC chargers, micro USB cable for computer, 10-30 volt in-vehicle charger)
·Quick Start Guide (Japanese available)
·GPS location data
·SMS (short messages)/E-mail 
(with one standard set)
Figures for continuous talk time and continuous standby time are based on average usage time in environments with proper signal reception.
Times may be reduced due to factors such as signal reception, temperature, settings, and battery condition.
Maximum message length is approximately 1,600 single-byte characters or 740 double-byte characters, including the recipient's E-mail address. Messages are divided into a maximum of 10 parts when sent.
IsatPhone Pro (TM) service area
Because Japan is located in an area within 30 degrees, the phone can be used with the antenna positioned straight up.
IsatPhone Pro (TM) is the trademark or registered trademark of Inmarsat Global Limited.