Generally, no. You do not jam the transmitter - you jam the receiver. But the receiver is on an Iridium satellite. If you have to jam from the transmitter's position, you have to use 100 times as much power, and an antenna that is just as good - and even that may be not enough, depending on the modulation of the signal.
Not an Iridium satellite. Rather an Inmarsat geosynchronous satellite.