I am a bit confused about Verizon's new tiered data plan. Currently, I am a BB user, but will be upgrading to iphone 5 when available in Sept. I have a 150MB data plan for $15 which was available back in Jan., but would like to keep the unlimited plan when upgrading. So, if I change my current plan to $29.99 unlimited before 7/07, would I still be able to keep it when getting an iphone 5? thanks for help!!!