Two timing rules decide when you can message a customer freely on WhatsApp and when you must pay for a template. Understanding them is one of the simplest ways to cut your messaging cost.
WhatsApp messaging runs on windows. When a window is open you can send freely; when it is closed you need an approved template, which you pay for. Two windows matter, and using them well keeps a large share of your messaging free.
When a customer messages you, a 24-hour window opens. Inside it you can reply with free-form messages, no template needed, and since November 2024 those service replies have been free for all businesses. Each new message from the customer resets the 24 hours. The catch: once the window closes, you cannot send a free-form message again until they write back; to reach them you must use a template.
Meta announced on 1 July 2026 that the free 24-hour service window ends on 1 October 2026. From that date, free-form replies inside the window are billed per message at the standard rate for the recipient's market, the same way template messages are billed today. Meta is due to publish exact per-country rates by 1 September 2026. The 72-hour ad window described below is unaffected and stays free for message delivery.
There is a second, more generous window. When a customer messages you from a click-to-WhatsApp ad or a Facebook Page call-to-action and you reply within 24 hours, a free entry-point conversation opens that lasts 72 hours. Inside it, even business-initiated messages are not charged. For businesses that run paid acquisition, structuring follow-up to land inside this window is a real saving.
The pattern is simple: get customers to message you first, through ads, a website widget, a QR code, or a quick reply, and then do as much as you can inside the open window. Reserve paid templates for when you genuinely need to reach someone who has gone quiet. Done well, this turns the cost structure in your favour.
As of mid-2026, every reply inside an open window is free. Inbound-first acquisition, ads, widgets, QR codes, keeps more of your conversations in that free zone and your template spend for when it truly counts — though from 1 October 2026 the 24-hour service window itself becomes billed per message, so this specific saving narrows to the 72-hour ad window after that date.
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