Ann, I ordered my GS3 before June 28 and bought it at the subsidized rate and kept my unlimited plan. The paperwork that came with the phone said "unlimited" data.
However, a few days later I received a strange e-mail from Verizon suggesting I go online and review "changes" to my data plan. I did. It said "2GB".
I called Verizon. The Verizon rep reviewed my order date and corrected my account back to unlimited. The rep said it might have been a problem with the website.
That's strange that it would change like that since you pre-ordered before the deadline of June 28. It is good that the rep was able to restore the data plan to what you ordered it under.
I'm most definitely NOT a VZW employee. If a post answered your question, please mark it as the answer.