WhatsMS: How to Use WhatsApp and SMS Together for Your Business

WhatsMS is the way people write "WhatsApp + SMS": using both channels together to message customers. It names a way of working, not one product, and it is not a WaSMS product name. Use WhatsApp for two-way conversations and media, use SMS for reach and short alerts, and run both from one inbox.

Key facts

| Fact | Detail | Source | |---|---|---| | WhatsApp rules | 24-hour window after the customer's last inbound message; approved templates only outside it; explicit user opt-in required | Window and templates: twilio.com/docs/whatsapp/key-concepts, 2026-11-01. Opt-in: twilio.com/docs/whatsapp/api, 2026-11-12 | | WhatsApp fees | Meta bills marketing, utility and authentication templates per message since 2025-07-01; Twilio adds $0.005 per message | developers.facebook.com/docs/whatsapp/pricing, 2026-09-23; twilio.com/en-us/whatsapp/pricing, 2026-11-01 | | US SMS fees | $0.0083 per 160-character segment on Twilio, plus carrier fees and A2P 10DLC registration | twilio.com/en-us/sms/pricing/us, 2026-11-01 | | SMS in WaSMS | Sent from your Android phone on your SIM: your SIM, your rates | wasms.net/features, 2026-11-11 | | WaSMS plans | Connect free; Reach $10/month; Grow $40/month; start free, no card | wasms.net/pricing, 2026-09-23 |

What does WhatsMS mean?

WhatsMS means WhatsApp and SMS used together. A search for "whatsms" can also be a WhatsApp-versus-SMS comparison, a hunt for a tool that sends both, or a typo for WhatsApp. This page covers the first two.

WhatsMS as shorthand for WhatsApp plus SMS

Read it as "WhatsApp + SMS". The real questions are which channel fits which message, and whether one team can run both.

A workflow, not a single product

WhatsMS describes a routing habit, not software. It is not a WaSMS product name. WaSMS is one way to run both channels in one inbox, covered below.

Consumer apps vs business messaging

Consumer apps are built for personal chats. Business messaging adds team access, templates and opt-in rules. Check the publisher before you install any app with a similar name.

WhatsApp vs SMS: what each channel does best

WhatsApp suits conversations. SMS suits reach and short alerts.

Conversations, media and follow-ups on WhatsApp

WhatsApp fits back-and-forth chats where customers reply, ask follow-ups or send files. Supported media include JPG, JPEG and PNG images, audio files and PDF files, up to 16MB per message (twilio.com/docs/whatsapp/api, 2026-11-12).

Reach and short alerts on SMS

SMS reaches any mobile phone with no app on the customer's side, so it covers customers who are not on WhatsApp. It suits codes, reminders and delivery notices. SMS is billed per 160-character segment, so a longer message uses more than one (twilio.com/en-us/sms/pricing/us, 2026-11-01).

The rules that shape both: the 24-hour window and opt-in

Twilio describes the WhatsApp customer service window as lasting 24 hours after the last inbound message you receive from a user. Outside it, you may only send an approved template (twilio.com/docs/whatsapp/key-concepts, 2026-11-01). WhatsApp also requires explicit user opt-in (twilio.com/docs/whatsapp/api, 2026-11-12). Treat consent as a per-channel task.

What WhatsApp and SMS cost, and who sets the rules

Meta sets WhatsApp's per-message pricing, and US carriers add fees to SMS. Twilio is used here as one example of a metered provider, not a market average.

WhatsApp: Meta's per-message model

Meta bills marketing, utility and authentication templates per message since 2025-07-01 (developers.facebook.com/docs/whatsapp/pricing, 2026-09-23). Twilio's fee is $0.005 per message, inbound or outbound, plus Meta's per-template fee (twilio.com/en-us/whatsapp/pricing, "current as of September 2026", 2026-11-01).

US SMS: segments, carrier fees and registration

Twilio's base rate is $0.0083 per 160-character segment. US carriers add per-message fees, and A2P 10DLC traffic is subject to registration onboarding fees (twilio.com/en-us/sms/pricing/us, 2026-11-01).

SMS from your own Android phone and SIM

WaSMS sends SMS from your own Android phone on your SIM: "your SIM, your rates" (wasms.net/features, 2026-11-11). What your carrier charges depends on your mobile plan.

A simple routing playbook for using both

Make this a written team process, not a hope.

Start on WhatsApp for two-way conversations

Make WhatsApp-first the default for customers who already chat with you. Appointment confirmations, order questions and renewals need replies, and WhatsApp keeps the thread and files together. If the customer's last message is more than 24 hours old, restart with an approved template.

Use SMS for customers who are not on WhatsApp and for short alerts

Send SMS when a customer has no WhatsApp, and for short alerts such as appointment reminders, order updates and renewal notices. If a WhatsApp message goes unanswered, a teammate decides whether to follow up by SMS. See the appointment reminder software guide and SMS vs WhatsApp vs email.

Collect opt-in for each channel

Ask for consent separately for WhatsApp and SMS, and record it on the contact. A yes to one channel is not a yes to the other.

Keep one thread per customer

Log every message on either channel against one customer record, so anyone on the team sees what was sent, where, and how the customer replied.

Run WhatsApp and SMS from one inbox with WaSMS

WaSMS puts WhatsApp plus SMS and email in one inbox (wasms.net/features, 2026-09-23). See also one inbox for WhatsApp, SMS and email.

Link your own WhatsApp number by QR pairing

You can link your own WhatsApp number in a few clicks by QR pairing. No Meta Business Manager or API account is required (wasms.net/features/whatsapp-api).

Add SMS through an Android device

Your Android phone becomes the SMS gateway, so you send and receive SMS inside WaSMS on your SIM (wasms.net/features, 2026-11-11). Here is how to link an Android device for SMS. SMS campaigns include scheduling and delivery reports (wasms.net/features, 2026-11-11).

Reply from one inbox, with AI Brain grounded in your content

Your team answers both channels from one screen. AI Brain is trained on your content and grounded in your content, and it reads the recent messages in the chat when it replies (wasms.net/features/ai-brain, 2026-11-12).

Plans and limits you can start with

Prices in USD (wasms.net/pricing, 2026-09-23). AI and API are enabled on all three plans.

• Connect: free. 500 contacts, 2 team members, 1 SMS device.
• Reach: $10/month or $84/year. 10,000 SMS sends per month.
• Grow: $40/month or $336/year. 5 SMS devices, 50,000 SMS sends per month.

Annual billing saves 30%. Start free, no card.

Start free with WaSMS: WhatsApp and SMS in one inbox, no card needed

What does 'whatsms' mean?

WhatsMS is the way people write 'WhatsApp + SMS': using both channels together to message customers. It names a workflow, not one product, and it is not a WaSMS product name. It can also be a typo for WhatsApp, so check the publisher before installing an app with a similar name.

Is WhatsMS a separate app or service?

No. WhatsMS is shorthand for a workflow, not an app or service from WaSMS. WaSMS is software that runs WhatsApp, SMS and email in one inbox.

Should a business use WhatsApp or SMS?

A business can use both. Use WhatsApp for two-way conversations and media, and SMS for customers who are not on WhatsApp and for short alerts. WaSMS lets one team run both from a single inbox.

Can I send WhatsApp and SMS messages from the same inbox?

Yes. WaSMS puts WhatsApp, SMS and email in one inbox (wasms.net/features, 2026-09-23). You link your own WhatsApp number by QR pairing and add SMS through an Android phone. The Connect plan is free, no card.

Do businesses pay per message on WhatsApp?

Meta bills marketing, utility and authentication templates per message since 2025-07-01 (developers.facebook.com/docs/whatsapp/pricing, 2026-09-23). Providers can add a fee: Twilio charges $0.005 per message plus Meta's per-template fee (twilio.com/en-us/whatsapp/pricing, 2026-11-01). WaSMS plan prices are at wasms.net/pricing.

Do customers need to opt in before I message them on WhatsApp or SMS?

WhatsApp requires explicit user opt-ins, per Twilio's WhatsApp documentation (twilio.com/docs/whatsapp/api, 2026-11-12). Record consent for each channel, since a yes to WhatsApp is not a yes to SMS. In WaSMS you can note it on the contact with tags or custom fields.