How do you flash Verizon phones?

That just depends on what kind of phone it is. If it is a regular phone (not a PDA such as a Blackberry or Palm, etc) you must have it done at the store. If it is indeed a PDA it is the opposite the store cannot even do the flash and can be done by going to the manufactures website (i.e. Samsung, Blackberry, Palm, etc) and look for anything that says software, patch, upgrade anything like that and it will download it onto your computer and BAM you just follow the directions.