This service is available using SMS on SIM based mobile devices of major telecommunication carriers in 17 countries and regions,
Thailand, Singapore, Malaysia, Indonesia, Vietnam, Philippines, Australia, India, Korea, China, Hong Kong, Taiwan, Myanmar, Cambodia, Laos, Guam and Japan (As of April 2018).
The coverage is expanding.
The service is available in the roaming areas outside of the country of the above described SIM issuing carrier.
In December 2013, e-mail transmission function became available in addition to SMS transmission. The enhancement enabled worldwide coverage and improved convenience for recipients of the message.