WhatsApp and SMS for a small business

Start with the purpose of the message

Separate a service update from a marketing campaign. A confirmation, change of appointment or access question is tied to a transaction. A promotion for another service is direct marketing and has different legal considerations. Decide which messages are necessary and which are optional before choosing a tool.

Map who sends the message, who receives replies and how the conversation is recorded. A “no-reply” reminder that asks the customer to confirm by replying creates a problem if nobody watches it.

When SMS helps

SMS works well for short, time-sensitive facts such as a booking time, a driver update or a change link. It does not require the customer to install a particular app. It can also be costly at scale and may be delivered after a delay, so do not rely on it as the only record of a critical agreement.

Keep the text concise, identify the business and include the action the customer can take. Avoid sensitive personal details in a message visible on a lock screen.

When WhatsApp helps

WhatsApp can be useful when a customer already uses it to ask questions or share a photo needed for a quote. It is conversational, which means your team needs clear ownership, response hours and a way to hand over context. A business account and platform rules may apply to automated messages.

Do not assume every customer uses WhatsApp or wants it. Offer another route, such as phone or email, for people who prefer one. Explain whether the channel is staffed outside opening hours.

Consent and marketing

For UK direct marketing by electronic messages, the Privacy and Electronic Communications Regulations can require consent or a valid exception, and UK GDPR duties also apply. The rules depend on the recipient and context. Do not add everyone who booked to a promotional list by default.

Record the permission you rely on, what people were told and how they can opt out. Make opt-out requests easy to act on across all connected tools. The ICO’s electronic marketing guidance is the source to check. This is general information, not legal advice.

Keep service messages useful

A taxi confirmation may need pickup time and place; a cleaner may need access details; an event venue may need a deadline for final numbers. Send messages at a time when the customer can use them. A reminder without a way to correct an error can increase calls instead of reducing them.

Test the message with a real booking scenario, including reschedules and cancellations. An old reminder after a change can be more damaging than no reminder.

Plan for replies and failures

Decide which inbox or person owns responses. If a customer replies “I cannot make it”, the booking record must be updated and the team told. Also decide what happens when a number is invalid or a provider is unavailable.

Use a shared process rather than one employee’s personal phone. Access should be reviewed when staff leave, and the business should control important accounts and numbers.

Respect customer information

Phone numbers and conversation content are personal data. Collect only what you need, restrict access and explain your use in a privacy notice. Consider whether photos, location details or special requirements reveal more than staff need. Decide how long messages are kept and how they can be exported or deleted.

A provider may process information on your behalf, so review its terms and data-handling arrangements. The contact-form privacy guide explains the general starting point.

Choose a small first step

Pick one journey, such as booking confirmation and one reminder. Write the wording, opt-out route where relevant, reply owner and failure fallback. Test it with staff before sending to customers. Only then consider marketing campaigns or additional automation.

Read connected communications for how channels can fit together. The practical measure is whether customers are better informed and staff can answer, not the number of messages sent.

Choose a provider with an exit path

Ask whether you can keep the number, export conversation records where appropriate and move templates or automations if you change tools. Confirm who pays per-message charges and how failed delivery is reported. A low subscription price can hide high message charges when volume rises.

Test a customer changing their number, declining marketing and replying outside opening hours. The system should route each case clearly. If one platform cannot handle the ordinary edge cases, simplify the workflow before adding more channels.

Questions you may have