I just called them because i have been going through data and costing myself extra money each month. Called to inquire about adding more data....they immediately saw i was on an older plan and bumped me to 12GB(4 lines) at the same price as I had been paying...also made it retroactive to the beginning of current month, so damage has been diminished...then the guy asks if i am a fios customer, i respond that I am, he then doubles my data at no extra charge...i was ready to spend more money for a bump in my data plan, turns out with minimal requests on my part, i walk away with 14 extra gigs of data and not paying one penny more.....
to often we only hear bad customer service stories(especially with wireless and cable customers), this was the exact opposite. carry on!