Static discharge to an un-grounded phone line. The lighting bolt it self did not hit, but the discharge (what you can't see) did, with no ground things fry. Out at your demark, on the service side of the box there is a bonding point, that should have a ground wire leading from that all the way down to your homes ground strap/rod. If that is not there, your phone lines are not ground which means it's the phone companies fault providing your not the one who removed the ground wire.
Quite possibly, they may have to replace some equipment if they failed to ground. Of course they are going to have a process to it which will include some investigation of course. If they put a new one in and still did not ground, yeah they really need to correct that.
You should have installed arrester for modem,phones and router.For hitting the house it requires a huge surge of current.But to destroy your phones etc,a small surge of current is enough to destroy these equipments.Make sure also whether your house is located in a high ground and if so you should get a qualified person to install an arrester.
Then check your grounding.whether your earth is grounded.Many things could have happened for the grounding to be disconnected.
It wasn't lightning. God dialled your number by accident.
Hit a power line between you and the transformer on the closest pole... zzzaaappppp!!!
Yep either it hit the phone wires between you and the nearest transformer (which would have grounded the bolt) or dragon has it right a massive static 'shot'... essentially amounts to the same thing... zzaap. That's why my phone box is grounded AND I have the incoming line right at the 110 block going through a 'shock stick'.