On the lookout for helpful info Jim Hamm steps up to the plate with this one: "Here's an article that provides some interesting information about your cell phone. We use AT&T, — just look at the 'generous' offer they made to us for only $29/month...(grin)"
Check out this article from USA TODAY: What cellphone companies don't want you to know http://www.usatoday.com/story/tech/columnist/komando/2015/03/13/cell-phone-privacy/70202468/
Kim Komando goes into some detail about "super cookies," how Facebook and cell phone companies AT&T and Verizon track and sell your information, how to turn off tracking — she likes DuckDuckGo. Read the whole thing.