Cell Phone Bill Shock Act of 2010 - Requires the Federal Communications Commission (FCC) to promulgate regulations requiring a commercial mobile service provider to: (1) notify a subscriber who has used in excess of a certain percentage of the monthly limit or prepaid amount of specified services (voice minutes, text messages, or data megabytes); (2) obtain a subscriber's consent before it allows the subscriber to use such services in excess of the monthly limit; and (3) ensure that any notice of possible excess usage, and the consent to use excess services, are not charged to the subscriber's account.