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SMS vs WhatsApp for business messages: which should you use?
SMS reaches every phone. WhatsApp reaches the people who live in it, which in many countries is almost everyone. The right choice depends on where your customers are, what you send and how much risk you can accept, and for many businesses the answer is both.
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Reach depends on the country
SMS works on every mobile phone, with no app and no internet connection. That universality is its biggest advantage.
WhatsApp needs the app and a data connection, but in much of Latin America, Europe, Africa, the Middle East and South Asia it is where people actually read and answer messages. In the United States, by contrast, SMS and iMessage remain the default for many people.
So start with your own customers, not global averages. Look at the country codes of your customers' phone numbers, and if you can, ask them which they prefer.
Side by side
| SMS | ||
|---|---|---|
| Reach | Any mobile phone | People with WhatsApp installed |
| Needs internet | No | Yes |
| Length and content | Short text, split into parts past 160 characters | Long text, images, video, documents, locations, contacts |
| Conversation | Replies possible, but feel impersonal | Natural two-way chat |
| Sender | A number or a registered sender name | Your business number, name and profile picture |
| Delivery information | Delivered, on most routes | Sent, delivered and read |
| Encryption | Not end-to-end encrypted | End-to-end encrypted |
| Cost model | Per message, varying by country | Depends on the route: per message on the official platform, or a plan on services like Oxtro |
| Rules | Carrier filtering, sender registration in many countries | WhatsApp's terms and policies, and its decisions on numbers |
When SMS is the better choice
- Critical alerts that must reach someone without internet access, such as fraud alerts or outage notices.
- Customers who do not use WhatsApp, or markets where SMS is the norm.
- One-way notices where no reply is expected and length is short.
- A fallback channel for when a WhatsApp message is not delivered.
When WhatsApp is the better choice
- Conversations. Customers ask questions, send photos and expect answers in the same thread. Support and sales work naturally there.
- Rich content. Order confirmations with an invoice PDF, a product photo, a location pin for a delivery.
- Trust. Messages come from a named business with a profile picture, in a chat the customer may already have, which looks less like the scam texts people have learned to ignore.
- Knowing what happened. Read receipts tell you whether the message was seen, not only delivered.
- Codes in countries where SMS is unreliable or expensive, or filtered by carriers.
Two ways to send on WhatsApp
The official WhatsApp Business Platform, through Meta or a provider such as Twilio. It needs a verified business, and messages you start outside a 24-hour window after the customer's last message must use templates approved by Meta. It is built for scale and backed by Meta's policies.
Your own number through a linked device, which is how Oxtro works. You link a number you already use by scanning a QR code, then send from the app or the API with no template approval. It is quick to start and keeps your existing number, but it is not the official platform, and WhatsApp can restrict a number it believes is sending spam. Our number safety guide explains how to keep that risk low.
Use both
The most reliable setup uses each channel for what it is good at:
- Ask customers for their number once, and say you will message them on WhatsApp.
- Send order updates, reminders and verification codes on WhatsApp first.
- Listen for failures. With Oxtro, a
message.failedwebhook tells your system right away. - Fall back to SMS for messages that failed or that must arrive regardless.
What does not change between channels
Whatever you choose, the same habits decide whether people read your messages or block you: message only people who agreed to hear from you, make each message useful to the person receiving it, say who you are, and make it easy to stop. Read 5 message patterns that get flagged as spam before your next campaign.