Who I have the same questioned this topic

I went to Verizon 3 weeks or so ago and specifically asked if and when there will be a buy one get one free.  Rep says Verizon doesn't usually do that with out a trade in.  So I but my wife the S9

Then I see "Buy one of our best Android phones. Get one on us"

Verizon rep only looking to make a sale.  After 14 years with Verizon prices go up, customer service only cares for the sale and absolutely no help if your phone is not working.  Had to take my S8 to a non Verizon store to fix it.

I think for me the best tips and tricks is to look for a carrier that actually cares about the customers