Well, when the phone dies, we're back to base level intelligence. With whatever we did or didn't know to begin with. Sure google helps answer a quick question or a bit of trivia but at the end of the day it's destroying our retention of knowledge.
I think the real problem is related very well in the movie "Idiocracy" Specifically in the first few minutes. High i.q. couple waits to have children, they wrestle with the implications. Low i.q. couple reproduce on a whim. He's got kids with the wife, the neighbor and the woman down the road. Five instead of one or two. Follow the trend for a few generations and it's essentially a story about evolution. With the end result being people of very low intelligence.