STRANGE mobile crossed line?

A fellow worker on our rig lives in Dubai. He is on his time off now and in Dubai. We're offshore in West Africa! This morning he was out jogging (Dubai) and listening to music on his IPhone. All of a sudden he could hear the morning call between the rig and the office onshore(We're IN WEST AFRICA!)
How the heck did that happen?

The phone was on the same radio frequency as the other call between the rig and office.

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