Having bought such a gizmo myself lately I think there are no "virtual" providers as there are with 3G/4G phones. There are representatives for Iridium
but I would be surprised if they can compete amongst each other.
Maybe on selling hardware
and certain conditions, but the service/subscripton fees
are charged by Irirdium.
We will be using the thing this summer only, so we decided to have the unlimited data subscription for the summer only. After that we will probably sell the unit. The costs of an all year-round subscription are very high. And suspending a subscription is not attractive due to the silly re-activation costs.
So when we are in need of Satphone again, we'll take it from there to see what is attractive.