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Timing and sequence
A common sequence is a first reminder within an hour of abandonment (while intent is warm) and an optional follow-up a day later, sometimes adding an incentive on the second touch. Test cadence against opt-out rate.
Opt-in and compliance
Cart-recovery SMS is marketing: send only to shoppers who gave marketing consent, honour do-not-contact lists, and respect quiet hours and local marketing law. See /answers/what-is-dnc and /answers/gdpr-for-messaging.
Personalize and incentivize carefully
Reference the specific item, keep the copy short, and use an incentive only when the margin supports it — habitual discounting trains shoppers to abandon on purpose.
Use the richest available channel
RCS and WhatsApp can show the product image and a one-tap return-to-cart button, lifting conversion over plain SMS while SMS remains the universal fallback. See /products/omnichannel and /answers/what-is-rcs-business-messaging.