"Credits and Adjustments"
Any credits posted to account. (Such as promotional or readjusted credits.)

"Access Charges"
Recurring, monthly charges.

"Airtime Charges"
Overages in airtime, SMS, data, or content.

"Other Charges"
Reactivation charges, etc.

"Anytime Minutes"
Minutes purchased with the plan.

"Peak Minutes"
Charged daytime minutes not included with the plan.

"Off Peak Minutes"
Charged night/weekend minutes not included with the plan.

"Free"
Minutes not charged to your account. (Such as minutes used for "611" calls.)