---
title: List Building and Consent — RGM Training
url: https://realgrowthmatters.com/training/sms-marketing/list-building-and-consent/
updated: 2026-06-10
source_html: https://realgrowthmatters.com/training/sms-marketing/list-building-and-consent/
---

[Home](../../../index.html) › [Training](../../index.html) › [SMS Marketing](../index.html) › List Building and Consent

RGM° · Training

# List Building and Consent

Foundational discipline. Sources, incentives, signup flow, quality, compliance, measurement.

### What you will learn

1. [Why list building matters](#why)
2. [Acquisition sources](#sources)
3. [Incentives](#incentives)
4. [Signup flow design](#flow)
5. [List quality](#quality)
6. [Compliance](#compliance)
7. [Measurement](#measurement)
8. [Advanced](#advanced)
9. [Mistakes](#mistakes)
10. [Checklist](#checklist)

## Why list building

SMS list size + quality determines program revenue ceiling. List building is the foundational discipline. Without it, sophisticated automation has nothing to send to.

## Sources

- Website popup (checkbox required for SMS).
- Checkout opt-in.
- Mobile-only landing pages.
- QR codes at events / retail.
- Social media drive-to-text.
- SMS-to-join keywords.
- Loyalty program integration.
- Lead magnets (SMS delivery).

## Incentives

- Discount on first order (most common).
- Free shipping.
- Free gift.
- Early access to drops.
- VIP tier inclusion.
- Test incentive levels.

## Flow

- Single SMS opt-in vs double opt-in.
- Phone number capture clarity.
- Disclosure requirements (above checkbox).
- Consent checkbox separate from terms.
- Welcome message immediate.
- Compliance language clear.

## Quality

- Real phone numbers (validation).
- Active subscribers (engagement metric).
- VIP / engaged tier identification.
- Geographic distribution.
- Demographic / behavioral segments.
- Quality > quantity.

## Compliance

- Express written consent.
- Disclosure language complete.
- Consent specific to SMS marketing.
- Records retained.
- Opt-out automated.
- Annual compliance audit.

## Measurement

- New subscribers per period.
- Subscriber source breakdown.
- Cost per subscriber acquired.
- Subscriber LTV by source.
- Active subscriber rate.
- Churn rate.
- Engagement rate.

## Advanced

- Multi-source acquisition strategy.
- Incentive A/B testing.
- Compliance discipline.
- Subscriber source quality tracking.
- Phone number validation.
- VIP tier identification.
- Engagement-based suppression.
- Annual list audit.
- Cohort LTV by source.
- Cross-channel coordination.

## Mistakes

- Consent buried in terms.
- Incentive too small or too large.
- Phone validation absent.
- Subscriber source quality not tracked.
- Engagement-based suppression missing.
- List bought (illegal).
- Annual audit skipped.
- Compliance reactive.
- Cohort LTV by source ignored.
- Cross-channel coordination broken.

## Checklist

- Multi-source acquisition
- Express written consent flows
- Phone validation
- VIP tier identification
- Engagement-based suppression
- Cohort LTV by source
- Annual list audit
- Compliance discipline
- Cross-channel coordination
- Cost per subscriber tracked

## Sources and further reading

- Klaviyo SMS list building benchmarks
- Attentive list building research
- Postscript list building
- TCPA consent guidance
- RGM Email Lifecycle list module
- MMA SMS guidelines
- Andrew Faris DTC SMS
- Common Thread Collective SMS
- Marketing Brew SMS coverage
- Twilio list building
- Recharge SMS integration
- OneTrust consent management

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Part of the [SMS Marketing](../index.html) series.