Updated: 12 February 2026

Business SMS Opt-In Process

SMS “Opt-In” Requirement (START)

Before you can exchange text messages with a customer/client, they must complete an opt-in process. The quickest way (especially for new customers/clients) is to ask them to text START to the same number you will be using to message them.


What you’ll see after you send the first message

After you send an initial message, you will receive an opt-in notice. The customer/client will not see the text of your first message.

Opt-in notice received by sender

What your customer/client will see

Your customer/client will see an opt-in prompt as well.

Opt-in prompt shown to customer

After they reply with START

Once they reply with START, you will receive a confirmation message. At that point, you will need to resend your original message.

Confirmation received after customer texts START

What your customer/client will see after opting in

Your customer/client will then see your message once you resend it.

Customer sees resent message after opt-in

Tip: To avoid delays, ask new customers/clients to text START to your texting number during your initial conversation so you can message them right away.