Iridium (numbers beginning +8816) You can send a free text message up to 160 characters to an Iridium phone either:  
  Inmarsat (numbers beginning +8707) You can send a free text free message up to 160 characters to most Inmarsat phones either:  
  Thuraya (numbers beginning +8821) You can send a free text message up to 160 characters to a Thuraya phone either:
  • via the web by clicking here
  • via email to [email protected] with the telephone number you are trying to message as the subject (without any 0 or + at the start), eg 88216XXXXXXXX
 
  Globalstar Europe (numbers beginning +336400) You can send a free text message up to 35 characters (Qualcomm phones) or 160 characters (Telit phones) to a Globalstar phone: