Me and most of my peers at work, have cell phone on either AT&T or Verizon and a MIFI/data service on the opposite one. The theory is it will be very rare that NEITHER has a signal and if they BOTH don't have a signal than most likely no one has a signal.
Since I work from the MH when we travel I added a Wilson external antennae, amp and internal antennae to up how many places I can get signal. That setup has warnings even before you buy it that you must have a signal in order for it to amplify it. If you have no signal at all in an area then the amp won't help.
:B
