Line Warm-Up Process

Learn how to build reputation for your iMessage, SMS, and WhatsApp lines to ensure maximum deliverability.

New line? Don't send 100 messages on Day 1 — you'll be flagged and blocked within minutes. The warm-up process builds trust with carriers over 14 days so your line can scale safely.

Before you start

Brand new Apple ID, SIM card, or WhatsApp account
Understanding of channel limits

Why Warm-Up Matters

Carriers and platforms use two filters to detect automated senders:

Velocity — How many messages you're sending per minute. Sudden spikes from a new number trigger immediate flags.
Reputation — The history of your account, specifically the inbound-to-outbound ratio. A number that only sends but never receives looks like a bot.

Because WhatSnap uses P2P messaging from real devices, carriers treat your messages like personal texts — as long as your sending stays inside the published warm-up limits. Warm-up ramps your volume gradually.

The 14-Day Schedule

Follow this schedule strictly to protect your line's longevity:

Week 1 — Establishing Identity

Days 1–3: 10–20 messages per day. Pacing: 1 message every 15 minutes.
Days 4–7: 30–50 messages per day. Pacing: 1 message every 5 minutes.
Critical goal: Get at least 5–10 replies per day from numbers that already have you in their contacts.

Week 2 — Scaling Volume

Days 8–11: 50–75 messages per day. Pacing: 1 message every 2 minutes.
Days 12–14: Up to 100 messages per day. Pacing: 1 message every 60 seconds.
Goal: Transition from friends and family to warm leads who are likely to reply.

Most blocks happen on Day 1 because users try to send a full campaign immediately. Patience is the key to scaling.

Automating Warm-Up with AI Agents

Manual warm-up means texting friends and waiting for replies — it works, but it's slow. Here are two ways to automate the process using AI agents.

Method 1 — AI Agent + Ad Campaign

Connect a GHL AI agent (or any conversational bot) to your WhatSnap line, then run a small ad campaign (Facebook, Google, etc.) that drives inbound messages to that number.

Connect your line

Connect your device to WhatSnap as usual.

Set up an AI agent

In GHL, create a conversational AI bot that can handle inbound inquiries — a simple FAQ bot or appointment scheduler works perfectly.

Run a small ad campaign

Launch a low-budget ad with a "Text us" CTA pointing to your WhatSnap number. Even $10–20/day generates enough inbound traffic for warm-up.

Let it run

Every inbound message + AI reply creates a natural conversation pattern. Carriers see real back-and-forth exchanges, building your reputation organically.

This method is ideal because the traffic is 100% real — actual people messaging your number from ads. Your line warms up naturally while you start generating leads from Day 1.

Method 2 — Two Devices Talking to Each Other

If you have two or more WhatSnap lines, you can connect AI agents to both and have them converse with each other automatically.

Connect two phones (or a phone + a Mac) to WhatSnap
Set up AI agents on both lines in GHL
Trigger an initial message from one line to the other
The AI agents start a conversation — each reply builds reputation on both lines simultaneously

This works especially well when warming up multiple lines at once. Five lines with AI agents can all cross-message each other, warming up your entire fleet in parallel.

When Warm-Up Isn't Needed

If your line is already receiving inbound messages, you likely don't need a formal warm-up. Inbound traffic naturally builds the reputation that carriers look for.

Common scenarios where warm-up is optional:

Your business number already receives customer inquiries
You're running ads that drive text messages to your number
You ported an existing number with established history

High-Volume Inbound Exception

Even with strong inbound traffic, we recommend a progressive approach if your reply volume will be very high (hundreds of outbound per day):

Connect multiple lines to distribute the load — don't funnel everything through one device
Use a GHL workflow with a split to delegate traffic across different lines automatically
Build a workflow with a Round Robin or If/Else action that routes contacts to different lines using tag-based switching

This keeps each individual line's volume within safe ranges while handling high total throughput.

Best Practices by Channel

Limit: 50–200/day.

Ensure your Apple ID has an active iCloud backup
Send messages to other Apple users first to build "blue bubble" trust
Inbound replies are heavily weighted by Apple's spam filters
Requires a physical Mac or Mac on VPS paired with an iPhone on the same iCloud account

Why Replies Matter

For all channels, the most important factor is the inbound reply.

A message that gets a reply validates your number with the carrier
Aim for a 1:3 ratio — 1 reply for every 3 messages sent
Use conversational, question-based scripts to trigger replies (e.g., "Is this still a good number for you?")

This is why AI agent warm-up is so effective — every automated conversation generates replies, keeping your ratio healthy without any manual effort.

Recovery — What If I Get Blocked?

If you notice delivery failures or messages silently not arriving:

Immediate Steps

Stop sending immediately — continuing to push messages through a flagged line makes it worse
Wait 48 hours — let the carrier's filters cool down
Check line status — verify the line is still active with your carrier (try sending a normal text from the phone's native app)

After 48 Hours

Restart from Day 1 volume — begin the warm-up schedule from scratch (10–20 messages/day)
Review what triggered it — common causes: too many messages too fast, links in messages, identical message content to many recipients

Early Warning Signs

Watch for these before a full block happens:

Signal	What It Means
Delivery rate dropping	Some messages silently filtered — slow down immediately
"Sent" but not received	Shadow block — carrier accepts but doesn't deliver
Sudden spike in failures	Hard block — stop and wait 48 hours
Recipients report spam warnings	Your content is being flagged — rewrite your scripts

If a line gets blocked twice, consider retiring that SIM and starting fresh with a new number. Repeated blocks damage the number's long-term reputation.

Common Questions

Do I need to warm up Twilio lines?

No. Twilio lines use A2P infrastructure with pre-registered sender IDs. Warm-up only applies to P2P lines — SMS (Android), iMessage, and WhatsApp.

Can I warm up multiple lines at the same time?

Yes. Each line warms up independently. Use the AI agent method to warm up your entire fleet in parallel without manual effort.

How do I know when warm-up is complete?

After 14 days of consistent sending with good reply rates (1:3 ratio), your line is ready for campaign volume. Start scaling gradually — don't jump from 100 to 1,000 messages overnight.