A pager wouldn’t have been able to connect to any networks at altitude.
I think it's safest to assume Hezbollah are using strong transmitters, because they'll want to be able to broadcast across rather large areas and in a way that resists potential jamming.
On the flip side, I'm having a hard time imagining these as threats to an entire airplane, given the tight constraints on how much explosive power can be secretly snuck into a functioning pager.
Receiving data from a network is a connection, no matter how you want to define it.