One of the most common methods is to use a business text messaging service  website form or checkout flow with a clearly labeled checkbox. To be valid, the box cannot be pre-checked. Next to it, include simple language such as: “By providing your phone number, you agree to receive promotional and transactional SMS from [Brand]. Message & data rates may apply. Reply STOP to unsubscribe.” This transparency both informs the user and protects the business.

You can also collect opt-ins through **keywords**. For example, customers text “JOIN” or “YES” to a short code or phone number. Immediately send an automated confirmation reply with the required disclosures and instructions to opt out. This creates a documented record of consent.

**Paper forms, in-store signage, event sign-ups, or QR codes** can also be used if they clearly state that the customer is enrolling in text alerts and describe what they will receive. The wording must be unambiguous: silence or implied consent (e.g., giving a phone number during a purchase without notice) is not sufficient.

Once consent is collected, send only messages that match what was promised. Do not switch a transactional-only opt-in (such as delivery notifications) into promotional texts unless you obtain additional permission. Always include a visible opt-out path (“Reply STOP to unsubscribe”). Honor opt-outs immediately.

Finally, **store proof of consent**. Maintain logs of when the user opted in, what language was shown at the time,