sms

Send the first message 30 minutes after abandonment with a cart link, a second at 4 hours with soft urgency, and an optional third at 24 hours with a discount. Avoid discounting the first message, since it trains customers to abandon carts deliberately.

A2P 10DLC registration is mandatory for US application-to-person texting since 2022, done through The Campaign Registry via your SMS platform. Without it, carriers throttle or filter your messages even when dashboards show delivered status.

Choose Klaviyo SMS if you already use Klaviyo for email, Postscript for deep Shopify integration, and Twilio for custom-built or transactional use cases. Attentive fits mid-market brands wanting full service, while Brevo suits EU-focused SMBs.

Use SMS for time-sensitive messages like cart recovery, shipping updates, flash sales, and auth codes where its 98% open rate within minutes matters. Use email for newsletters, education, and long-form nurture content that can wait.

Messages over 160 GSM-7 characters split into multiple billed segments, and emojis or accented characters force UCS-2 encoding at 70 characters per segment. Keep copy short, limit emojis, and reserve MMS for high-impact moments.

TCPA requires express written consent, clear opt-in disclosure with frequency and STOP instructions, immediate honoring of opt-out keywords, and no marketing sends before 8am or after 9pm recipient-local time. Keep auditable consent records with timestamps and disclosure text.