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Having said that it also seems quite plausible that Israel just knew that some particular brand of pagers in some region of Lebanon was used by their targets, and so they just sabotaged thousands of them in the vague hope that they would get a hit.
I suspect we will never get enough info about how this attack was carried out to know.
Unreliable number of terrorists aside, by more than a few reports the Lebanese ambassador to Iran [1]... not good looks for a government constantly claiming to have no relationship with Hezbollah.
[1] https://www.yahoo.com/news/irans-ambassador-lebanon-injured-...