You should understand that what happened in Lebanon involved the government of Isreal physically modifying the pagers (and walkies) in question by adding explosives to them, turning them into remote-triggerable bombs.
(The term “supplychain attack” has been used a lot to describe this attack. Isreal intercepted the order of pagers between when the order was placed and when the pagers were delivered. And either physically altered the pagers ordered or replaced them with altered/tampered-with pagers.)