Marketing
SMS vs WhatsApp for Business: Cost, Reach and When to Use Each
SMS reaches every mobile phone without internet; WhatsApp offers rich, two-way conversations and is often cheaper for transactional messages. Here is how they compare on cost, reach and features, with real prices.
MonoChat Team Updated: 7 min read
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SMS and WhatsApp solve different problems. SMS reaches every mobile phone, works without an internet connection and needs no app, which makes it the safest choice for critical alerts. WhatsApp offers rich, two-way conversations with images, buttons and forms, and its utility and authentication messages are usually cheaper than SMS in many countries. Most businesses get the best results by using WhatsApp as the main conversation channel and SMS as a fallback.
The right choice depends on your customers’ country, the type of message and whether you expect a reply. This guide compares cost, reach, features and rules, with real 2026 prices.
SMS vs WhatsApp at a glance
| SMS | WhatsApp Business API | |
|---|---|---|
| Reach | Any mobile phone with a signal | People who use WhatsApp and are online |
| Internet needed | No | Yes |
| Pricing unit | Per segment (160 plain characters, or 70 with emoji or non-Latin text) | Per delivered message, by category and country |
| Message length | Long messages split into several billed segments | One message, no segment charges |
| Rich content | Text and links (MMS in some markets) | Images, video, documents, buttons, lists, carousels, forms |
| Two-way conversations | Possible with two-way numbers | Built in for every message |
| Sender identity | Number or sender ID | Business profile with name and logo |
| Delivery and read status | Delivery reports | Sent, delivered and read statuses |
| Rules for outreach | Country-specific registration and consent rules | Opt-in required; templates outside the 24-hour window |
| Best for | Critical alerts, fallback, customers without WhatsApp | Conversations, support, rich notifications, campaigns |
SMS vs WhatsApp cost: real examples
SMS is priced per segment, not per message. With Twilio, a message in the standard GSM-7 character set fits 160 characters in one segment; longer messages split into segments of 153 characters. If the message contains an emoji or non-Latin characters, it switches to UCS-2 encoding, where one segment holds only 70 characters (67 per segment in longer messages). A 200-character message with one emoji can cost three segments.
WhatsApp is priced per delivered message, by category and the recipient’s country, with no segment charges. Since October 1, 2026, service replies inside the 24-hour window are charged too, at the same rate as utility messages, after the first 1,000 per business phone number each month. Our WhatsApp API pricing guide explains each category.
Here is how one message compares, using Twilio’s published SMS prices and Meta’s October 2026 WhatsApp rate card:
| Recipient country | SMS (Twilio, per segment) | WhatsApp utility / authentication | WhatsApp marketing |
|---|---|---|---|
| United States | $0.0083 plus a carrier fee of about $0.0025 to $0.005 | $0.0034 | $0.0250 |
| United Kingdom | $0.0560 to mobile numbers | $0.0220 | $0.0635 |
| India | $0.0832 | $0.0014 | $0.0118 |
What this means in practice:
- Transactional messages are usually cheaper on WhatsApp. In all three markets, a WhatsApp utility or authentication message costs less than one SMS segment.
- Marketing is closer, and sometimes SMS wins. In the US, a single-segment SMS plus carrier fees costs less than a WhatsApp marketing message. In India, WhatsApp marketing is far cheaper than Twilio’s SMS price.
- Long or emoji-heavy SMS gets expensive fast, because each extra segment is billed.
Example: 10,000 order updates in the United Kingdom
SMS, 1 segment each: 10,000 x $0.056 = $560
WhatsApp utility template: 10,000 x $0.022 = $220If the SMS version runs to two segments because you add a tracking link and a personal greeting, it costs $1,120. The WhatsApp message can include a button to track the order at no extra charge.
SMS also has costs outside the per-message price. In the US, application-to-person messaging on standard 10-digit numbers (A2P 10DLC) requires registration, which has its own onboarding fees.
Reach: where each channel wins
SMS wins on universal reach. Every mobile phone can receive a text, there is nothing to install and no data connection is needed. That matters for:
- Customers who do not use WhatsApp, which is more common in some countries than others.
- Moments when the customer may be offline, such as traveling or in an area with poor data coverage.
- Critical alerts that must arrive, such as fraud warnings or service outages.
WhatsApp wins on engagement. In markets where most people use WhatsApp every day, it is where they already talk to friends and family, and they can answer you in the same chat. You also get a business profile with your name and logo, so customers know who is writing.
Features: what WhatsApp can do that SMS cannot
A plain SMS is text and a link. A WhatsApp message can carry much more:
- Buttons and lists so customers answer with one tap.
- Images, videos and documents, such as a product photo, a boarding pass or an invoice PDF.
- Carousels that show several products in one message.
- WhatsApp Flows, forms that open inside the chat for bookings, surveys or lead capture.
- Read statuses, so you know whether a message was read and not only delivered.
- Ongoing conversations with your team, an AI assistant or both, in the same thread.
Compare the same appointment reminder on each channel.
SMS:
Bright Dental: Reminder of your appointment tomorrow at 10:00. Reply YES to confirm or call 020 0000 0000 to change.WhatsApp utility template with buttons:
Hi Sara, this is a reminder of your appointment at Bright Dental tomorrow at 10:00. [Confirm] [Reschedule]
If Sara taps Reschedule, the conversation continues in the same chat: an assistant offers new times, and a person can step in if needed.
Rules and compliance
Both channels require consent, but the rules work differently.
- WhatsApp requires opt-in. Meta says businesses must clearly state that a person is opting in to receive messages, name the business they are opting in to, and comply with applicable law. Outside the 24-hour customer service window, you can only send Meta-approved templates. Message quality also decides whether Meta raises your messaging limits. Read WhatsApp opt-in for how to collect consent.
- SMS is governed by telecom regulators and carriers in each country, with requirements such as sender registration and opt-out handling. The details vary by market, so check the rules for each country you send to.
When to use SMS, when to use WhatsApp
Use WhatsApp for:
- Customer support and sales conversations.
- Order, delivery and booking updates where customers may want to reply.
- Authentication codes in markets where WhatsApp is widely used.
- Campaigns to opted-in customers that benefit from images, buttons or product carousels.
Use SMS for:
- Customers who do not have WhatsApp.
- Critical alerts that must reach people even without a data connection.
- A fallback when a WhatsApp message cannot be delivered.
- Short, one-way notices in markets where SMS is cheaper than WhatsApp marketing.
Use both when reach and engagement matter equally: send on WhatsApp first and fall back to SMS when needed, or let customers choose the channel they prefer.
How to run SMS and WhatsApp together in MonoChat
In MonoChat, WhatsApp and SMS sit in the same unified team inbox, so you do not have to pick one channel or manage two tools.
- Connect both channels. WhatsApp connects through the official WhatsApp Business API. SMS connects through your Twilio account with the Twilio integration, for OTP codes, alerts, reminders and two-way conversations.
- Reply from one place. Inbound SMS and WhatsApp replies land in the shared inbox with agent assignment, tags, notes and customer history.
- Automate the channel choice. In workflow automation, you send SMS from workflow nodes, wait for replies and branch by response, and fall back to WhatsApp, email or a human agent.
- Let AI handle replies. AI routing understands inbound SMS, detects intent and routes the conversation to the right team, with human handoff when confidence is low.
- Estimate WhatsApp costs first. The bulk messaging calculator uses Meta’s October 2026 rate card, so you can compare it with your SMS costs before a campaign.
MonoChat has a free Basic plan with one agent and one channel at app.monochat.ai; see the pricing page for plans with more channels. SMS fees are billed by Twilio, and WhatsApp message fees follow Meta’s rates.
Sources
- Meta for Developers: Pricing on the WhatsApp Business Platform
- Meta for Developers: Pricing for non-template messages
- Meta for Developers: Getting opt-in for WhatsApp
- Meta for Developers: Template messages overview
- Twilio: What is the SMS character limit?
- Twilio: SMS pricing for the United States
- Twilio: SMS pricing for the United Kingdom
- Twilio: SMS pricing for India
Put this into practice with MonoChat