sms

Use a 3-message sequence: Send 1 at 30 minutes after abandonment with a gentle reminder and no discount, Send 2 at 4 hours with soft urgency, and Send 3 at 24 hours with a discount if margins allow. Each message needs a sender ID, one CTA with a short link, and roughly 160 GSM-7 characters.

Choose Klaviyo SMS if you already use Klaviyo for email, since it shares one subscriber profile across both channels. Choose Postscript if you are on Shopify and want deeper SMS-specific features like AI Reply and advanced abandoned cart automations.

No. TCPA requires express written consent for marketing SMS, captured with clear disclosure language, frequency expectations, and STOP/HELP instructions. Checkout phone capture only covers transactional messages directly related to that order, and violations carry $500–$1,500 per message in statutory damages.

A2P 10DLC registration is required since 2022 for US businesses sending SMS through 10-digit long codes. Without it, carriers throttle or filter your messages. Registration covers brand verification, campaign use case, sample messages, and opt-in flow documentation through The Campaign Registry.

Emojis force UCS-2 encoding, which cuts the segment size from 160 GSM-7 characters to 70. A message that would be one segment becomes two, doubling the per-send cost. Curly quotes and accented characters pasted from Word or Google Docs trigger the same issue.

Healthy opt-out rates are under 2% per send and under 0.5% for promotional sends. Higher rates signal over-sending or poor relevance; reduce frequency to 1–2 promotional sends per week, segment by engagement, and run re-engagement flows for cold subscribers.