By QuickMessage Team · Last updated November 3, 2026
Quick answer
SMS reaches almost any mobile phone, with or without internet, which makes it dependable for OTPs and critical alerts. WhatsApp needs the customer to have WhatsApp, but it supports images, buttons, two-way chat and detailed delivery reports, which makes it stronger for marketing, support and conversations. In India, both have rules: SMS needs DLT registration of your business, sender ID and templates; WhatsApp needs the customer's opt-in and approved templates. Many businesses use both.
SMS vs WhatsApp at a glance
| SMS | WhatsApp Business API | |
|---|---|---|
| Reach | Almost any mobile phone, no internet needed | Customers who use WhatsApp, with internet |
| Content | Text only, with character limits | Text, images, video, documents, buttons and lists |
| Two-way chat | Limited | Full conversations, chatbots and a team inbox |
| Sender identity | Registered sender ID (header) | Your business name and profile |
| Reports | Delivered or failed | Sent, delivered, read (if enabled) and failed, plus replies |
| India rules | TRAI DLT: register your business, sender IDs and every template; promotional SMS is restricted for numbers on the DND (NCPR) list | Customer opt-in; Meta-approved templates for messages you start |
| Pricing | Per SMS, set by your provider | Per delivered message by category; on QuickMessage ₹0.96 marketing, ₹0.18 utility and authentication |
When SMS is the better choice
- OTPs and security alerts that must reach customers even without internet.
- Customers who do not use WhatsApp, or whose WhatsApp status you do not know.
- Backup for critical alerts when a WhatsApp message fails.
When WhatsApp is the better choice
- Marketing with images and buttons, such as product launches and festive offers.
- Conversations: customer questions, support and sales follow-ups.
- Automation: chatbots that answer, qualify and route customers.
- Order and booking updates that customers can reply to.
Using SMS and WhatsApp together
- WhatsApp first, SMS as backup: send order updates on WhatsApp; if a message fails, send the same update by SMS.
- SMS for OTPs, WhatsApp for everything after: verify on SMS, then continue the relationship on WhatsApp with the customer's permission.
- Ask for WhatsApp opt-in by SMS: invite existing SMS customers to receive updates on WhatsApp. See WhatsApp opt-in.
SMS and WhatsApp from QuickMessage
QuickMessage offers both: the official WhatsApp Business API with a shared inbox, chatbots and campaigns, and transactional SMS and OTP SMS for India. Talk to our team about the right mix for your messages.
Frequently asked questions
Is WhatsApp better than SMS for marketing?
For customers who use WhatsApp, it supports images, buttons and two-way chat, which suits marketing. SMS reaches phones without internet and is useful for customers who are not on WhatsApp. Many businesses use both.
Do I need DLT registration for WhatsApp?
No. DLT registration is a TRAI requirement for commercial SMS in India. WhatsApp has its own rules: customer opt-in and Meta-approved templates.
Should I send OTPs by SMS or WhatsApp?
SMS reaches phones without internet; WhatsApp authentication templates can offer a copy-code or autofill button. Some businesses send OTPs on WhatsApp and fall back to SMS if delivery fails.
Use the right channel for every message
Get advice on combining WhatsApp and SMS for your business from our India-based team.
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