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Sorry I've forgotten the name of the app but a quick search under the terms-

"cellphone prepay security camera app alarm remote"

turned up this Apple one
...

There are cellphone apps out that can use a cellphone as the alarm

I've got this pretty roughly from a mate who is actually in the know but it goes kinda like this-

1 Buy cheap cellph on prepay...

Wouldn't hurt to whack a PIR in there and hook it up to your alarm as a separate zone, provided that you don't have rats and whatnot moving through the area but yeah, as Res said it is the same as in...