So either this was planned long enough ago to replace a large number of devices over time, or communication about a larger order has been provided to the enemy

So either this was planned long enough ago to replace a large number of devices over time, or communication about a larger order has been provided to the enemy and fulfilled without suspicion. Either way, that sounds like a crazy infiltration effort. Also, we can assume that anything sent to those pagers so far has been forwarded to Israel and now that channel is burned, right?