Cold email response rates have collapsed. LinkedIn is saturated. Then somebody discovers that a message in a blue bubble gets read within minutes and often gets a real reply, and the entire outbound playbook gets pointed at it.
The mechanism is worth being honest about: it works because the channel is personal and has not been flooded. Every one of those properties is consumed by using it at scale.
Start with the legal position
This is not email, and B2B is not an exemption
In the US, TCPA governs messages to mobile numbers, and it does not carve out business-to-business. A mobile number is a mobile number, statutory damages are per message, and "they were on a company website" is not consent. Get advice specific to your situation before you run cold outbound to mobiles. The legal overview and the compliance page.
The practical consequence is that this channel is far better suited to warm outbound than to cold prospecting: people who filled in a form, requested a demo, met you at an event, gave you a card, or are already customers. That is not a limitation so much as a description of where it works best anyway.
Speed is most of the effect
The single highest-value use is speed to lead. Someone requests a demo at 2:14pm; a message arrives at 2:16pm from a named person. Response rates to that are not comparable to anything you can do by email, and it does not require volume.
Priya Anand
iMessage
Priya — Marcus from Kestrel. Saw your demo request just now. Quick one: is this for the Denver warehouse or the whole network?
whole network, we're at 6 sites
Got it — that changes what I'd show you. Thursday 10 or 2, 20 minutes?
Thursday 10 works
The speed-to-lead mechanics are worked through here — the industry differs, the arithmetic does not.
Sequence design
If you must sequence, keep it short. Three messages, wide gaps, and each one has to earn its place.
| Message | Timing | Job |
|---|---|---|
| 1 | Within minutes of the trigger | One specific question. Not a pitch. |
| 2 | Day 3, only if no reply | New information — a relevant result, a specific answer. |
| 3 | Day 8, only if no reply | A clean close. "Should I stop?" Then stop. |
Three, not eleven. Every additional touch buys a smaller increment of reply and a larger increment of block, and a block on this channel is worse than an email unsubscribe — it removes you permanently, and it is a signal against your line. What that does to your number.
Writing for the channel
- Name yourself and your company in the first six words. An unknown number is a threat; a named person is a message.
- One question, not a pitch. The reply is what you are optimising for.
- Under 300 characters. If it needs more, it needs an email — send that and reference it here.
- No links in the first message. A link from an unknown number reads as phishing.
- No merge-tag tells. "Hi {FirstName}" ships more often than anyone admits, and it is instantly fatal on a personal channel.
- Write like a person who is busy. Lowercase where natural, no marketing cadence. How to write one.
Volume discipline
This is where sales teams get their lines killed. Outbound tooling assumes hundreds of touches a day; this channel does not survive that. Realistic ceilings are 30–50 new conversations a day per line after a proper warm-up, and one provider publicly caps cold outreach at around 50 new contacts a day for exactly this reason.
If your model needs more, buy more lines rather than pushing one harder — and question whether a channel that punishes volume is the right place to put a volume strategy. Pacing and warm-up.
Measure the right thing
- Reply rate, not open rate. Replies are the channel's entire advantage.
- Meetings booked per hundred sends, split against your email baseline.
- Block and opt-out rate. The leading indicator of channel damage; watch it weekly.
- Delivered rate per line. A quiet decline means trouble before anyone notices.
- Pipeline attributed through tagged links, once links are appropriate. How to tag, how to value it.
The rule that keeps the channel alive
Send only to people who would not be surprised to hear from you. That is a commercial rule as much as a legal one — surprise is what produces blocks, and blocks are what end this channel for everyone using it.