Neither is universally "better." SMS and email serve different jobs — and the small businesses winning at customer communication use both, strategically.
The mistake most businesses make: they pick one, use it for everything, and wonder why half their messages get ignored. Here's how to use each correctly.
The Numbers Upfront
| Metric | SMS | |
|---|---|---|
| Open Rate | 98% | 22% |
| Time to Read | 3 minutes | 6–8 hours |
| Click-Through Rate | 19–36% | 2–5% |
| Opt-Out Rate | Higher (2–5%) | Lower (0.1–0.5%) |
| Cost per Message | $0.01–$0.03 | Fractions of a cent |
| Best for | Time-sensitive, action-required | Detailed content, relationships |
When to Use SMS
SMS wins when the message is time-sensitive, short, and requires an action. If you need the person to act within the next few hours, SMS is your tool.
- Appointment reminders — 48hr and 2hr before the appointment
- Missed call follow-up — "Sorry we missed you! What can we help with?"
- Flash promotions — "Slow week — we have 3 openings today. Reply to grab one."
- Review requests — direct link, sent 30–60 min after service
- Lead follow-up — first contact after a form submission or inquiry
The rule: if someone needs to see it today and act on it, send an SMS.
When to Use Email
Email wins when you have more to say, when the message is informational rather than urgent, or when you're building a relationship over time.
- Newsletters and educational content — monthly "tips from your [service provider]"
- Detailed offers or proposals — price breakdowns, service descriptions, before/after photos
- Confirmations and receipts — customers expect to find these in their inbox
- Long-form re-engagement campaigns — more context than a text can hold
- Cold outreach to businesses — B2B communication still largely lives in email
The Combination That Gets the Best Results
The highest-performing campaigns use SMS to get attention and email to deliver the detail. Here's the sequence:
- Day 1 — SMS: "Hey [Name], just sent you an email about something that might help your business this week. Worth a look!"
- Day 1 — Email (30 min later): Full offer, case study, or detailed proposal lands in the inbox
- Day 3 — SMS follow-up: "Did you get a chance to see that email? Happy to answer any questions — just reply here."
Email open rates when preceded by an SMS alert are 60–80% higher than standalone email campaigns. The SMS primes them; the email delivers the substance.
No separate platforms, no manual sending. Set up the sequences once and they run automatically.
SMS Rules You Must Follow
SMS is powerful — which is why it's regulated. Breaking these rules means fines and your number getting flagged as spam:
- Always get explicit opt-in — a checkbox on your booking form, or a verbal agreement. Don't text people who didn't say yes.
- Always include opt-out — "Reply STOP to unsubscribe" must be in every broadcast message
- 2–4 broadcast messages per month max — more than that and opt-out rates spike. Transactional (reminders, confirmations) are exempt.
- Personalize with first name — "Hey Sarah" vs "Hey there" = dramatically higher response rates
Building Your Lists: Where Most Small Businesses Get Stuck
The most common question: "I don't have a list." You probably do — you just haven't formalized it. Start here:
- Phone numbers: Every booking, every call, every form submission — capture the number and get opt-in consent. Most businesses already have hundreds of numbers in their phone or old CRM.
- Email addresses: Ask at checkout, include a field on your booking form, put a QR code on your receipts linking to a "stay in touch" page.
- SMS keyword campaigns: "Text BOOK to [number] for exclusive deals" — promoted on social, in-store, on your Google listing
The winner for most service businesses: SMS first, email second. Most service businesses have phone numbers, not email addresses. Start building the channel you actually have access to.