You would have to guarantee those phones would eventually end up in the right person's hands.
Otherwise if you sabotage 100 phones and only 30 go to your targets, even if you only detonate those 30 there are now 70 phones out there randomly floating around with enough explosives to kill some random person.
But this only works if you know the identity of every member of the organization, which is impossible, again making this a terror campaign and not a targeted attack. And you have to detonate them all at once or people will throw away the devices. You can't wait for the 100,00 people who belong to the organization to have just unlocked their devices all at once.
I'm not sire what you're replying to. My comment was that using smart phones wouldn't be effective in the way you mentioned. Relying on people 100,000 people that belong to Hezbollah to unlock their phones all at the same time to verify that's who is holding the device. There is no possible way to make an attack like this targeted. It would always result in a large percentage of innocent casualties no matter what you do. The only use for it is a terrorist attack, which is what this was.
This is the key thing here. People can whine about this attack, but this was targeted and it worked with low collateral damage, which also makes it legal (as in not a war crime).
The problem is everything else that Israel is doing since Oct 7, causing 1/3 of the Palestinian casualties to be children.
Customary international humanitarian lawprohibits the use of booby traps – objects that civilians are likely to be attracted to or are associated with normal civilian daily use – precisely to avoid putting civilians at grave risk and produce the devastating scenes that continue to unfold across Lebanon today. The use of an explosive device whose exact location could not be reliably known would be unlawfully indiscriminate, using a means of attack that could not be directed at a specific military target and as a result would strike military targets and civilians without distinction.