Yellowknife
WKR
Have you ever run the 9505?
I'm not sure I've "run" one very much, but yes, I think I've probably used all of the various generations of Iridium at some time or another, although I've logged by far the most hours on the 9555 series. Are you using the 9505 or the 9505A? I seem to see more of the A series in service, and I know we have one still operational in our small inventory. Other than the 9505A being a bit bulkier and slightly less intuitive to use, I don't recall noticing any serious difference in call quality between the older and newer phones. They all suck to some degree.
Biggest issue I've had with the 9555 was a firmware glitch last year that required a wipe and reflash at the dealer. Phone would flip back and forth between showing 5 bars and 0 bars about every 30 seconds and I couldn't make a call. Pulling the battery for a hard reboot got it to work just long enough to call the float plane, and then it was back to being flaky. That was annoying.
As a side note, for long term base camps the Iridium docking stations for the 9555 are great (albeit, not cheap). They can run off 12V or 120V and really clean up call quality.
Yk