Would think that with conventional cell phone towers a maximum of 10 miles apart, possibility of service on the ISS would be pretty unlikely. Also, with ISS zipping along at ~5 miles per second, don't think the system would be able to establish a call with so many handoffs occuring. Doppler shift will further scramble electronics.<br /><br />What kind of doppler is allowed on Iridium system?<br /><br />Seems like they are advertised to work on the Concorde, but that's not even 1 mile per second.<br /><br /> <div class="Discussion_UserSignature"> <p><font color="#ff0000"><strong>TPTB went to Dallas and all I got was Plucked !!</strong></font></p><p><font color="#339966"><strong>So many people, so few recipes !!</strong></font></p><p><font color="#0000ff"><strong>Let's clean up this stinkhole !!</strong></font> </p> </div>