Comment by AlbertCory

If you put yourself in the position of Hezbollah's IT chief, you get a different picture than this question assumes.

Let's assume you're somewhat competent and aware of supply chain vulnerabilities.

Let's also assume that pagers are not that popular anymore, and you insist on a pager that's completely passive. It can't emit any signals at all, or the Mossad would track it.

So you probably find some supplier of gear to the Iranians and other non-Western countries, and give them your specifications. That supplier is reliable, you think. It probably listens to a signal that Hez and only Hez transmits. It's Security By Obscurity, the choice of naive buyers everywhere.

You certainly don't buy anything off the shelf. Well, we know what's wrong with Security By Obscurity: Mossad only has to decipher one secret.