An iPhone without a speedy data plan is somewhat “crippled” in terms of its user experience, and for folks who fall under the 5%, you will know because AT&T would have sent a text message to your inbox which reads, “Your data usage is among the top 5 percent of users. Data speeds for the rest of your current bill cycle may be reduced.”
To be very clear: if you have a “limited” 5GB (or more) plan, you don’t have to worry about throttling. If you go over, AT&T will gladly charge you extra for the above-limit data.
The idea that an unlimited plan can be sold, and crippled down the road will probably anger the users, but they are probably still on a contract anyway. What do you think? Does it seem fair to you that such a modification can be subsequently added? Also, what does it mean in terms of Gigabytes of bandwidth? When is too much… too much?