Consent obtained for the sake of the TCPA does not have an expiration date. However, it may be revoked by the consumer at any time. Additionally, the consent is tied to the individual consumer, not the phone number itself. Thus, when a phone number is transferred to another user, a business does not necessarily maintain consent to call that number. Lastly, your consumer consent is only valid if it can be proven. Consent record-keeping is a critical component of any TCPA compliance policy. Experts recommend keeping records of express written consent for 5 years in order to help bolster protection against legal action.