SMS flows are automated message sequences triggered by specific events or behaviors, delivering the right message at the right time. Common SMS flows: - Welcome series (new subscriber) - Abandoned cart recovery - Browse abandonment - Post-purchase follow-up - Win-back (churned customers) - Birthday/anniversary - Subscription reminders - Back in stock alerts Flow components: - Trigger event - Time delays - Message content - Conditional logic - Exit conditions Flow best practices: - Start simple, iterate - Respect frequency limits - Coordinate with email - Test timing and content - Monitor opt-out rates Performance benchmarks: - Abandoned cart SMS: 10-20% recovery - Welcome flows: 50%+ engagement