How to warm up a number on the WhatsApp Business API
A new WhatsApp Business API number does not start with unlimited reach. Meta places every fresh number in a low messaging tier and watches how recipients react to your first sends. Blast thousands of marketing templates on day one and you risk a Low quality rating, template pauses, or even a flagged number. Warming up means deliberately ramping your daily volume while keeping block and report rates near zero, so Meta steadily raises your tier from 250 to 2,000 to 10,000 to 100,000 unique recipients per day. This tutorial walks through the full warm-up sequence on InfiQ, the official Meta Business Partner platform, with the exact pacing, template choices, and warning signs that decide whether your number climbs or stalls.
What you'll do
Warming up a WhatsApp API number means ramping your daily sends gradually while keeping quality high. Start with opted-in, engaged contacts, favour utility over marketing early, double volume only when quality stays Green, and let InfiQ monitor tier upgrades. Done right, a new number reaches the 100K/day tier in two to four weeks.Step 1 — Confirm the number is verified and set a quality baseline
Before any warm-up, the number must be fully live: connected to the WhatsApp Business API through InfiQ, with Meta Business verification complete and a display name approved. Open the number's quality panel and note where it starts. A brand-new number starts at the 250 unique-recipient tier while unverified, moving to 2,000 once Meta business verification is complete, with no quality rating yet, and its rating is only calculated after real recipients start receiving messages. Do not begin sending until display name approval and business verification are both green, because a rejection or restriction at this stage compounds any warm-up damage. Treat this step as establishing a clean baseline you can protect.
- Verify the WhatsApp sender is active and the display name is approved in InfiQ.
- Complete Meta Business Manager verification if it is still pending.
- Record the current messaging tier and (if shown) the quality rating so you can spot the first shift.
- Confirm at least a handful of high-quality, pre-approved templates exist to send.
Step 2 — Seed the first sends with your most engaged, opted-in contacts
Meta judges a warm-up number heavily on how the very first recipients respond, so quality of audience matters more than quantity. Start with a small list of contacts who genuinely expect to hear from you: recent customers, people who messaged you first, or subscribers who explicitly opted in. Reaching cold or scraped numbers early is the fastest way to collect blocks and reports, which is exactly what drags a rating to Low. Keep day-one volume modest — a few dozen to a couple hundred recipients — and prioritise conversations that are likely to earn a reply, because inbound replies open the free 24-hour service window and signal healthy two-way engagement.
- Send first to customers who transacted or messaged recently and clearly opted in.
- Avoid purchased, scraped, or long-dormant lists during the warm-up phase.
- Prefer messages that invite a reply so recipients open a two-way conversation.
- Keep the very first batch small so any quality dip is caught before it spreads.
Step 3 — Lead with utility templates, hold heavy marketing back
WhatsApp bills per delivered message by category — marketing, utility, or authentication — since Meta moved off per-conversation billing on 1 July 2025, and the categories carry very different risk during warm-up. Utility templates (order updates, appointment reminders, OTP-style authentication) are expected, welcomed, and rarely reported, so they build positive signal cheaply. Marketing templates are the most likely to trigger blocks on a young number. Early in the ramp, weight your mix toward utility and authentication, and introduce promotional marketing only once the rating is holding steady at Green. Make sure every template uses the correct category at approval time — a marketing message sent as utility can be recategorised or rejected, and it distorts both your cost and your quality signal.
- Front-load utility and authentication templates; they earn trust with low report risk.
- Introduce marketing templates gradually, after quality proves stable.
- Categorise each template correctly when submitting it for approval.
- Remember cost is per delivered message by category, so the mix affects spend too.
Step 4 — Ramp volume gradually and let quality gate each jump
The core discipline of warm-up is patience: increase daily volume in steady steps rather than one giant leap. A reliable pattern is to roughly double the previous day's send count as long as quality stays Green, pausing to hold flat (or step back) the moment the rating slips or block rates climb. Meta raises your messaging tier automatically when you send to enough unique recipients within a rolling window while maintaining a good rating — hitting volume alone is not enough if reports spike. The tiers climb 250 → 2,000 → 10,000 → 100,000 → unlimited unique recipients per 24 hours, and a clean number typically clears them over two to four weeks. Resist the temptation to push to a campaign-sized blast before the number has earned the headroom.
- Roughly double daily volume only while the rating stays Green.
- Hold flat or reduce for a day if quality dips or blocks rise.
- Understand upgrades need both sufficient unique recipients and low negative signals.
- Expect two to four weeks to reach the 100K/day tier with clean engagement.
Step 5 — Monitor quality, react fast, and go live in InfiQ
Warm-up is not fire-and-forget. In InfiQ, watch delivery, read, block, and report signals after every batch, and treat any drop from Green to Yellow as a stop sign rather than a curiosity. If the rating falls, cut volume, pause the templates that recipients are reporting, and revert to your most engaged audience until it recovers — a rating can climb back with a few days of clean sending. Once the number holds Green across several ramp steps and reaches the tier your campaigns need, you are effectively warmed up: schedule real broadcasts with confidence and keep monitoring so a single bad campaign does not undo the work. InfiQ's India-based support can review your ramp plan and flag risky templates before they cost you a tier.
- Check delivery, read, block, and report metrics after each batch.
- Treat a Green-to-Yellow shift as a signal to pause and diagnose, not ignore.
- Pause reported templates and fall back to engaged contacts to recover a rating.
- Once quality holds at the tier you need, move to full campaigns while still monitoring.
Frequently asked questions
What does warming up a WhatsApp number actually mean?+
How long does warm-up take?+
Can I just send a large campaign on day one instead of warming up?+
Which template types are safest to send while warming up?+
Does the quality rating affect what I pay?+
What should I do if my quality rating drops during warm-up?+
Do I need a developer to warm up a number on InfiQ?+
How is the messaging tier different from the quality rating?+
Warm up your number the safe way
Talk to InfiQ's India-based team and we'll map a ramp plan that lifts your new number to the volume you need without risking your quality rating.