Iridium and Inmarsat are the constellations of choice for the pedigree users - this offer is a lot better than the last sat phone that popped up here that was on the spotty hobby grade global star band. And at $500 this is a great deal - borderline theft at $400 - anyone considering a sat phone should jump on this.
For greater traction there is probably much BIGGER interest/demand for your listing on the coastal forums than inland lake forums. As you pass 12 NM on any ocean my Starlink switches to a $2000 a month on my plan, and on the flip side the iPhone T-mobile free emergency text LEO access has softened demand for those inside the TSB. But there is still HUGE GIGANTIC demand for this exact combo, the 9555 on Iridium.
If you don’t see a cash offer soon, consider posting your offer on sail / cruise / expedition forums - Panbo.com, seabits.com, thehulltruith.com, cruisersforum, forums.ybw.com and expeditionportal.com for the overland group.
Service plans can be expensive, but a lot of plans include free text and free inbound calls - pretty easy to figure out how to make that work. If you need ALOT of data look at the Iridium GO that links your iphone on any carrier to the Iridium LEO network, crushing the T-mobile smart phone to LEO in every measure.
This product at this price is a smoking hot deal.
... I was thinking a WW friend would be interested and the reason for the discount.