Not knowing much about the Verizon buy-one-get-one deal, does that mean that their are actually only 1/2 as many android and blackberry phones sold last quarter that are in use?
No because the free phones would still be in use, but the person using it may not have gotten a Android/RIM phone if not for the deal.
Example: A father has a smartphone from work. His wife likes using it to check her e-mail, use apps, etc. so when they buy new phones they buy a smart phone for her to use. If there is no b1g1 than their teenager would have just gotten a regular phone but because of the deal they have an extra "free" smartphone that they give to him/her to use.
