Phone Bills

When do phone bills usually arrive?  Because we're figuring that Brother will announce his eagerness to return home at right around the time the human who is currently stuck with him gets her phone bill.  We hate to think of how high that thing is.  We hopped out for breakfast this morning, and of course we got harassed with texts demanding to know what we were up to.  We were thinking of hopping to the library tomorrow but we're not sure how to sneak past Brother's bugs.  We're sure the librarians would be very annoyed to have texts constantly coming in in their establishment.  Perhaps we could put little slippers on our paws to muffle to sound of our steps.  That might fool him.