Text messages:
SMS, RCS or WhatsApp in 2026?
Three ways to send a text to a customer: SMS, universal but basic; RCS, richer but fragmented in support; and WhatsApp, with its 2 to 3 billion users, its media and its read receipts. We compare the three channels, then show how to send your WhatsApp messages unlimited.
The context
Which text message channel should you choose in 2026?
Sending a text to a customer can go through three very different channels - SMS, RCS and WhatsApp - which offer neither the same reach, nor the same format, nor the same cost.
SMS remains the smallest common denominator: it works on any phone, with no app or data connection, and that's what makes it strong. But it's limited to 160 characters per segment, with no media or reliable read receipt, and it's billed for every segment sent - a cost that climbs fast at scale.
RCS (Rich Communication Services) is meant to be the "SMS of the future": rich messages, images, buttons, read indicators. In practice, its support remains fragmented - it depends on the carrier, on Google on Android and, only recently, on Apple on iPhone. Depending on the recipient's device and network, your rich message often falls back to plain SMS.
WhatsApp, on the other hand, depends on neither the carrier nor the phone model: with 2 to 3 billion active users, native media, reliable read receipts and a very high open rate, it's the most consistent customer messaging channel. That's exactly what Unlimited Messaging makes accessible - sending those WhatsApp messages unlimited, at a flat price, from your normal account.
Comparison
SMS / RCS vs WhatsApp, channel by channel
The same goal - getting a text message to your customer - but three channels with very different trade-offs. Here, line by line, is how SMS and RCS measure up against WhatsApp sent via Unlimited Messaging.
| SMS / RCScarrier network | WhatsApp (Unlimited Messaging)your account, via API | |
|---|---|---|
| Reach / adoption | Universal (SMS); RCS still fragmented | 2 to 3 billion active users |
| Message format | 160 characters per segment (SMS) | Long text, emoji, formatting |
| Media (image, PDF, video) | None in SMS; hit or miss in RCS | Native images, PDF and videos |
| Read receipts | Unreliable or absent | Reliable sent / delivered / read |
| Cost | Billed per segment, varies by country | Flat monthly price, unlimited |
| Cross-platform reliability | RCS depends on carrier / Google / Apple | Identical on iPhone and Android |
| API / unlimited | Existing API but billed by volume | REST API, unlimited sends |
| Setup | Carrier or aggregator contract | A few minutes, normal account |
Our approach
The reach and richness of WhatsApp, without the per-message cost
We take the widest and richest text channel - WhatsApp - and make it unlimited, at a flat price, from the account you already use.
A reach of 2 to 3 billion
Instead of betting on the recipient's RCS support, you reach the most universal messaging channel after SMS - and far more consistent in open rate.
Native media and receipts
Images, PDFs, videos and sent / delivered / read receipts, where SMS stays plain text and RCS is unpredictable depending on the device.
Unlimited messages, flat price
No per-segment cost, no rate that climbs with volume. A clear monthly subscription, unlimited WhatsApp messages.
Your account, ready in minutes
You link your normal WhatsApp account by scanning a QR code. No business account, no carrier contract, no waiting.
- Active WhatsApp users
- 2-3 BActive WhatsApp users
- Characters per SMS segment
- 160Characters per SMS segment
- Countries covered natively
- 180+Countries covered natively
- From account to first message
- 5 minFrom account to first message
How it works
Move from SMS to WhatsApp in three steps
- 1
Link your account
Connect your existing WhatsApp account to Unlimited Messaging by scanning a QR code, like WhatsApp Web. No dedicated number, no carrier contract.
- 2
Choose your recipients
Reuse the same numbers you were contacting by SMS. If the contact is on WhatsApp - which is the case for most - the message goes out via WhatsApp.
- 3
Send your messages
From the dashboard or the REST API, send text, images and PDFs unlimited, and track delivered / read receipts in real time.
FAQ
Questions about text message channels
Sources
Sources & references
To check the information in this article for yourself:
Written by
Ilian · Senior Software Engineer
A senior software engineer, he founds and runs several tech companies. He builds products around messaging APIs, automation and AI integration, and shares here what he learns while building.
Choose the text channel that truly reaches your customers.
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