WhatsApp isn't just "SMS with read receipts." It runs on its own platform with rules that protect users from spam — and those rules shape how and when you can message a customer. Understanding three of them, the service window, templates, and your business profile, is the difference between WhatsApp working smoothly and your messages getting rejected.
The 24-hour customer service window
This is the single most important WhatsApp concept, and it surprises every team that's new to it. When a customer messages you, a 24-hour window opens. Inside that window, you can reply freely with any message — text, photos, voice notes, whatever the conversation needs. The clock resets every time the customer sends a new message.
Once 24 hours pass with no message from the customer, the window closes. To re-open the conversation, you can't just send a free-form text — you have to send a pre-approved template (see below). The moment they reply, the free-form window opens again.
What this means day to day: answering an active customer is completely free-form and instant. Reaching back out to someone who's gone quiet for a day needs a template. Go2Msg shows you, on every thread, whether the window is open — so your team never wonders why a message won't send.
Message templates, by category
Templates are pre-written, pre-approved messages used to start a conversation or re-open a closed window. WhatsApp sorts them into three categories, and the category determines how it's used (and priced):
| Category | What it's for | Example |
|---|---|---|
| Utility | Follow-ups tied to a specific transaction or request the customer initiated | "Your item is ready for pickup. Reply here with any questions." |
| Marketing | Promotions, offers, re-engagement, anything not strictly transactional | "We're buying gold this week at premium rates — bring yours in." |
| Authentication | One-time passcodes and login verification | "Your verification code is 481920." |
Templates need WhatsApp's approval before use, which usually takes a short review. Go2Msg manages submission and keeps your approved templates ready to drop into a thread.
A verified business profile
On the Business API your number carries a real profile — your business name, logo, address, hours, and website — shown to customers in the chat. It's the difference between a customer seeing "your shop" and seeing an unknown number. Eligible businesses can also pursue the green verified badge for added trust.
Rich messaging
Within an open window you get WhatsApp's full toolkit: high-quality images and video, documents (think appraisal PDFs or receipts), voice messages, and quick-reply buttons. It's a far richer back-and-forth than plain SMS, which matters when you're walking a customer through photos of an item.
One WABA, many teammates
The reason WhatsApp works for a team at all is the Business API: your number lives on a WhatsApp Business Account (WABA) at the platform level, and everyone signs in as themselves rather than passing one phone around. That's a topic in its own right — we walk through exactly how it works, and why a shared login is the wrong way, in the One WABA, many teammates walkthrough.
WhatsApp questions, answered
Can I use my regular WhatsApp number?
A number can only live in one place at a time. A phone number currently active in the consumer WhatsApp or WhatsApp Business app has to be migrated to the Business API to use it here — it can't run in both at once. We guide you through that during setup.
Why won't my message send to a customer?
Almost always the 24-hour window has closed — the customer hasn't messaged in over a day. Send an approved template to re-open the conversation; once they reply, free-form messaging works again. Go2Msg shows the window status on each thread so this is never a mystery.
Do I need templates for everyday replies?
No. Templates are only for starting a conversation or re-opening a closed window. While a customer's window is open, your team replies with normal free-form messages.
Is WhatsApp messaging attributed and audited like SMS?
Identically. Every outgoing WhatsApp message is tagged with the teammate who sent it and written to the same audit trail as your SMS. See Same audit, either channel.
Offer WhatsApp the right way
One WABA, every teammate signed in as themselves, every message accounted for. Free 14-day trial, no credit card.
Start free trial