Jihadis cartels, the big narco-trafficing cartels and pedophiles are fans too. All have their fingers crossed for the ability to thwart the 4th amendment. Well, the shareholders, too.
Actually, no, it isn't. The Isis websites recommend disposable Android burner phones you buy with anonymous phone numbers not associated with any name which you can throw away, not any phone which requires a registered phone number.

Like the two burner phones the two San Bernardino terrorists SMASHED with hammers and threw into a lake along with the smashed hard drives removed from their computers and carcasses of their computers as well. Try to keep up with real world facts instead of your fevered desires driven by Apple hatred.