Bills to customers shall be issued monthly, unless the OSP's approved terms and conditions of service prescribe a different interval. Bills may be issued on a billing cycle. All end-users shall receive their bills via the United States mail, unless the end-user agrees with the operator service provider to receive a bill through different means, such as electronically via the Internet. Whatever the method of delivery, bills shall comply with 165:57-10-3.
Okla. Admin. Code § 165:57-10-1