Section 10.250 - Notification to existing subscribers of non-participation in WEA(a) A CMS provider that elects not to transmit WEA Alert Messages, in part or in whole, shall provide clear and conspicuous notice, which takes into account the needs of persons with disabilities, to existing subscribers of its non-election or partial election to provide Alert messages by means of an announcement amending the existing subscriber's service agreement.(b) For purposes of this section, a CMS provider that elects not to transmit WEA Alert Messages, in part or in whole, shall use the notification language set forth in § 10.240 (c) or (d) respectively, except that the last line of the notice shall reference FCC Rule 47 CFR 10.250 , rather than FCC Rule 47 CFR 10.240 .(c) In the case of prepaid customers, if a mailing address is available, the CMS provider shall provide the required notification via U.S. mail. If no mailing address is available, the CMS provider shall use any reasonable method at its disposal to alert the customer to a change in the terms and conditions of service and directing the subscriber to voice-based notification or to a Web site providing the required notification.73 FR 54525, Sept. 22, 2008, as amended at 78 FR 16807, Mar. 19, 2013