I got an email from AT&T customer support notifying me of a change to my data plan. This seemed odd to me because I was under the impression nothing changed with my data plan when I upgraded to the iphone 4 on 6/24. well after calling up customer care, they confirmed that my data plan was changed from $30/unlimited to $25/2gb!!! When i was in the store on 6/24 I asked the AT&T store employee at least 5 times to make sure my data plan doesn't changed. he straight lied to my face! I called up the manager today and he said he's been hearing of a few cases of this...he blamed it on a bug in AT&T equipment upgrade system. just sharing my story with you all to make sure you check your account after iphone4 upgrade.