Iphone 5 resetting texting on phone bill?

On iphone 5 you can reset the cellular usage, does this actually reset it to where the text messages before the reset will not be counted on the phone bill? Will it say there was a reset on the phone bill? And does imessage count as text messages on an att phone bill for an iphone 5?

The internal data/message counts are for your convenience. They have nothing to do with billing, You could reset them 10 times each day and it doesn't change your bill.