Independent estimates peg Hezbollah membership in Lebanon to a wide range, 20k to 50k. Reporting says the pager shipment was 5000 units and so far ~3000 known targets. Figure some devices broke, hadn't been activated yet, didn't trigger correctly, etc. Figure not every member needed or had a pager, call it 50% to be safe but it might be reasonable to think only the equivalent of a team leader would have one. Either way this is a significant fraction of their contact capabilities.