Following: I too won't be adding an AT&T plan to my truck when I already have a Verizon Data Plan. I ordered my UConnect 5 with NAV and better have a working NAV system without having to purchase an AT&T Plan. I know you don't need a cell phone signal for NAV. The only reason the AT&T data plan is needed, is if you want to use your laptop, IPad, etc to watch movies, do web research, check email, etc. I don't have kids so the only time I would need a Data signal would be to look something up on the internet and I won't be doing that while I'm driving down the road. I'll pull over and just use my Verizon Hot Spot for this purpose. I already get all my email on my phone, but I don't read my email while driving down the road either.... lol