On our recent trip it necessitated we had contact with
home- so we aquired a IsatPhone pro unit for this purpose.
A couple of issues...At times it took a long time, from boot-up, to aquire the satellite for a Ready for Service condition.
Antenna direction was very critical to maintain a 4 bar status for reception.
Any obstruction-like a tree banch- voided aquisition.
When aquisition was 'good'...it may drop out after a while.
000, 1800 & 13 numbers are unusable.
We had entered all our needed numbers into speed-dial before we left on the trip.
It was also necessary for the other party to know contact was on Sat. phone- as the delay was very obvious.
In an emergency situation with a 'panicking' user- I would consider the unit not the most user-friendly.
We were surprised at some of the more remote locations we did have signal (if only 1 bar)on our normal Telstra Next-G cell phone!!!
HF comms through VKS737 proved 98% reliable- with on 2 occasions we had to make contact via a relay from another member. We had excellent reception with Charters Towers when in Qld, and Alice or
Adelaide bases when in the Centre, Simpson &
Corner Country. (BTW we use a tapped whip-not an Autotune. On comparisons the tapped whip seems far more efficient)
Cheers
J&D