AT&T on Thursday put limits on its Unlimited Data plans, slowing speeds for 3G and 4G customers who exceed 3 GB in a billing cycle and capping 4G LTE customers at 5 GB.
They will slow down the speed for heavy iPhone users but still allow unlimited data.
I figured I must be a heavy usage user. Turns out I’m not even close, with a mere 500 MB a month or so. But then much of my iPhone usage is via wi-fi.
To check your usage on an iPhone 4S, Settings/ General/ Usage/ Cellular usage