Yeah, I've been wondering how the fuck they pulled this off. If it turns out that the only pagers that exploded belonged to Hezbollah members, then that would signal to me that this was done entirely digitally.
I've heard that batteries (can't remember if it was laptop or phone batteries) contain the energy of a small grenade, but getting it to release that energy all at once without physical access is absolutely fucking wild and has serious fucking implications for device security.