If you are an iPhone owner on a pay-as-you-go data plan, the end is near: AT&T has announced that the iPhone OS 3.0 upgrade will terminate your data service. The reason: A "technical change." Update from AT&T.
This the message that that some prepaid users got:
AT&T Free MSG: A new software upgrade for iPhone will be available on 6/17. This upgrade may affect your data service. Please visit att.com/iphone or call 800-901-9878 for a representative. If you download the software and are not on an approved iPhone data plan, your data service will be interrupted.
Meanwhile, Erica at TUAW has called AT&T and confirmed that they want pay-as-you-go users to move to a full data plan. According to the technician: "Based on your plan [official iPhone GoPhone plan], you will not receive the same quality service on your GoPhone plan, even with the same equipment. This is a technical change on AT&T's end on how we service that data plan."
Update: Apparently, Erica was misinformed, according to our contact at AT&T. This is not a change in policy at all, and the pay-as-you-go data plans were really never approved for iPhone.