hmmm note up front I am a SPOT ambassador..
the irridium seems to be a problem sending /recieving messages from SPOT units...
bear hunt 2 irridium in reach units 1 spot unit.....Ibelieve i sent /recieved 140 messages in 15 days..home cell,friends cell,and numerous hunters in the field nearby....cant recall any issues.
both units are better than no comunication.from SPOT to WILLIAMS LK..message recieved in under 5 minutes.