Health Care -- If Government Doesn't Do It, Who Will?

"so theoretically an anti-texting law is extra-Constitutional."

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Yes, I believe a national anti-texting law would be "extra-Constitutional" and that is why local jurisdictions, rightly, passed the law you speak of. The argument as to whether it is wise to prohibit a certain dangerous activity is a very different discussion than whether the federal government has the power to do so under the Consitution.

The Tenth Amendment: "The powers not delegated to the United States by the Constitution, nor prohibited by it to the states, are reserved to the states respectively, or to the people."