My friends had the same issue when they stayed in the Cars section last fall. We were staying at SSR and our friends were at AoA, we figured we would just call each other every night to coordinate plans for the next day since both groups had small kids. Both of us had issue will cell service, she has AT&T, and I have Verizon. Her service was much more sketchy than mine over at SSR. We ended up having to text which was a pain, and they took forever to go through. WDW has always been an issue for cell service in certain spots for us for years!