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Assuming you aren't joking: Pagers are receive-only, which is why they'd use them in preference to cellphones, which transmit even when just idling to register on cells.

Pagers are receive-only

This has not been true for some time. Pagers attach to a network in the same way a cell phone does. It is true they are more reliable in the receive only sense, as they can receive the broadcast message in the area they last attached to and the acknowledgment is not required to see the message but they do indeed transmit.

Not these pagers

Yes, almost certainly HA was running a POCSAG network.

Pagers are immune to a number of threats that two-way communications devices enable.

With a cell phone, the bomb is conveniently express-shipped to you by F-16. Or thoughtfully hand-delivered by the Mossad Postal Service.