Vincenzo - The Garmin can't get Honey Boo Boo and Snooky clips downloaded to it. It's a safe bet that the future remains bright for Garmin because only intelligent people use their products in the first place. However, the rest of the world has a serious problem brewing.
Is your cell phone also built into the panel of your airplane so your autopilot gets its routing from it? Has it been selected by Embraer, Cessna, and Bombardier for use in their jets? Does it float so you don't have to worry as much when hiking or boating? Does your cell phone provide navigation in the middle of Utah where there is no cell reception?
I have a Verizon call phone with GPS too. It actually works quite well and I use it on occasion. However, as a serious travelling tool, it falls short. I mounted a NUVI on a small custom console bar along with my Sirius control box down near my gearshift control. I can program it with one hand, with the heel of my hand steadied on the shifter. It is semi-permanently wired in so battery life is never an issue. It has on board maps. It is quick response. It works in the hinterlands. It is easy to read. It has the absolute best user interface. I can easily re-program or enter a query on the fly. I can, at a glance, tell you when I will arrive. All of these things with my cell phone? Not so much.