The Israeli press is reporting that the pagers were new models, recently delivered to Hezbollah. (No, I don’t know what a “new model” of a 1980’s technological device is.)
The Mossad would have had to detonate the pagers fairly soon after they arrived in Hezbollah hands, because every day that went by would be a day risking discovery and then the jig would be up (all it would take would be for one out of thousands of users to open up the device for maintenance or repair some day and then the mini-bomb might be noticed by someone who knows electronics.)
I suppose an alternative conspiracy theory is that Hezbollah equipped their members with pagers packed with explosives to make them into involuntary suicide bombers?
They don’t. They get a page that says (123) 456-7890 (for example; I don’t know what Lebanese phone numbers look like), and they reference the single-use cipher they’ve got in their pocket to figure out that that means “The guns will be arriving at Dock 15 in crates labelled “fresh bananas”” or something of that nature.
Yahoo News link, apologies if it is repeating other links but it does indicate that the pagers were sabotaged during production:
“The Mossad injected a board inside of the device that has explosive material that receives a code. It’s very hard to detect it through any means. Even with any device or scanner,” the source said.
I have to say, I like this approach a lot more than the ham-fisted “bounce the rubble” strategy in Gaza. This is some old school Mossad right here.