One important point about unmetered mobile network services is, that the provider really starts to care about caps. As long as they are payed by package, no matter what, they don't really give a damn if you ruin yourself. As soon as they have to care about throttling down your connection, to make sure you don't use more "premium" speed, than you payed for, expect things to change very quickly.
As for water or gas bills - if you have one week water leakage in your home, the water bill is probably the least of your problems. Turning off water and gas before leaving your home is probably more efficient. Oh, and also unplug unneeded electrical appliances like your telly, the set-top box(es) and your IT equipment.
Penguin - they like flooded apartments.