sms

Use a 3-message flow: 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 and flow builder. Choose Postscript if you want SMS-first tooling with the deepest Shopify integration, AI replies, and conversational SMS features.

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 like order updates related to that specific purchase.

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.

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 cause the same issue.

A healthy opt-out rate is under 2% per send overall and under 0.5% for promotional sends. Rates above that signal over-sending or poor segmentation, and you should reduce frequency, segment by engagement, and run re-engagement flows for cold subscribers.