OfTheDamned
The Friendly Undead
I was under the impression that most if not all of Verizon's current 3G towers have simply been upgraded to 3G/4G towers by strapping on new antenna arrays and installing new base station equipment. Recycle the old tower by upgrading it.
That is more or less my understanding of is as well. The thing is, they still have the 3G equipment up there. They aren't going to just let it rot. They spent a ton of money on that equipment.