Order updates are the messages customers actually want. "Your order is confirmed", "out for delivery", "delivered" — these get read, and they set the tone for how a customer feels about your brand. The question is not whether to send them but on which channel.

What SMS does well

• Universal reach. Every mobile number can receive SMS, with or without data, with or without a smartphone.
• Speed. Transactional SMS is prioritised and typically read within minutes.
• Simplicity. Nothing to install, nothing to opt in to for transactional content.

What it cannot do: show the product, offer choices, or let the customer reply beyond a link tap. A 160-character limit also means every message competes for space.

What WhatsApp does well

• A conversation, not a broadcast. "Can I get it after 2 PM?" is a reply, and your team or automation can answer in the same thread.
• Rich content. Product image, delivery window, a Track order button and a Change address button in one message.
• Verified identity. Your name and logo appear on the chat, which customers trust more than a numeric sender.
• History. The customer can scroll back to every update and receipt.

What it cannot do: reach customers who do not use WhatsApp, or customers who have not opted in.

Side by side

	SMS	WhatsApp Business API
Reach	Every phone	Phones with WhatsApp, opted in
Content	Text, 160 chars	Text, images, documents, buttons, lists
Customer action	Tap a link	Reply, tap a button, browse a catalogue
Two-way	No	Yes, 24-hour service window after a reply
Sender identity	Registered header	Verified business profile with logo
Regulation	DLT templates	Meta template approval, opt-in

The rule of thumb

Notify on WhatsApp, fall back to SMS. Send the update as a WhatsApp utility template to customers who have opted in and are reachable; if the message is not delivered within a short window, send the SMS version automatically. Customers get the richer experience where it is possible and the reliable one everywhere else.

Two exceptions:

• OTPs: SMS first, because speed and universality matter more than richness. WhatsApp authentication templates work well as a fallback.
• Critical failures (payment failed, delivery cancelled): send both, and consider a voice call for high-value orders.

Setting it up

A combined flow needs three things: an opt-in capture at checkout, templates approved on both channels (DLT for SMS, Meta for WhatsApp), and a rule engine that tries WhatsApp first and falls back. This is exactly what our WhatsApp Business API and Bulk SMS services do together. Tell us your order volume and we will design the flow with you.