Palestine Press Agency reports that Hamas is building its own communications network similar to the private one that Hezbollah built in Lebanon. The network uses a fiber-optic backbone.
A fiber optic network has two major advantages to the terrorists: it cannot be jammed electromagnetically, and it is very difficult to tap. Any attempts to tap fiber optics require a physical presence on the ground, and they are easily noticed and isolated by the network infrastructure.
The Hezbollah and Hamas networks use Chinese components with features (and presumably architecture) built by Iran.