Another way of dealing with 2 celllular bills can be...

For the primary cell phone service have a family plan addon for 10$ a month. That can take care of incoming and emergency calls.

And then you have the unlimited hspa for 30$ a month.

That way you can keep your bill below 50.

That is how i plan to do it.

I would try to make most of my calls via skype so that i do not use much of my family plan minutes.