These pagers were distributed only to Hezbollah members, these were not just standard pagers anyone could buy.
They use a standard phone.
It did, however, mention that an 8 year old girl was killed by one of them. Which is a foreseeable consequence of widely distributing a bunch of bombs and then detonating them without regard for who’s nearby.
The pagers were not secure at all also.
The range is tiny. Go watch some videos, for example this one: https://x.com/DrEliDavid/status/1836037485492629605
People standing directly next to the target are unharmed.