Hi Hoppy,
This is Topher, an IT support representative, from Global
Marine Networks. You can not get past the SIM error
screen without having a valid SIM in it. If you have a nearby friend with an
Iridium 9505a, 9555, or 9575, you would simply put their SIM into the phone you are looking at
buying to see if works. You could also buy a 75 minute prepaid SIM from
Iridium Prepaid Airtime: 75 Minutes, 1 Month Validity
which would be your cheapest option to test your phone out. If you are considering
email,
weather, and other services over Satellite, you may considering getting a package deal with a new phone, which will save you
money as well.
Iridium 9555 Savings Bundle | Global Marine Networks