How is the Verizon cellular service for the iPad in tall buildings? Especially in lower manhattan??? I work on the 14th floor in lower manhattan and my iPad 3 with AT&T cellular service is horrible! Only one to two bars; three if I'm lucky - and that is ony on 4g! If I turn on the lte, I only get one bar! Thinking of trading in my current att iPad for the Verizon iPad so any advice you have would be great, thanks.