If I don't want to use Google because of their tracking, I can use DuckDuckGo.
If I don't want to use Comcast because of their tracking, my other options are Comcast, Comcast, Comcast, and Comcast. I think you're being a bit disingenuous by focusing on cellular carriers and not mentioning wired broadband providers where we have no competition, no consumer choice, and no market solution to abuses by the service provider.
Your criticism of email is somewhat more fair. While there are alternative services available that you could use, the majority of your contacts are going to choose to fork over all of your information to Google. But if you're really concerned about that, you can find other channels to contact them. That's still a better situation than the ISP market that most Americans are stuck with.