Start with the log
Find the booking under Reports → Notifications → SMS Log. Status: sent, pending, or failed with error code.
Quota exceeded shows STARTER_QUOTA_EXCEEDED. Upgrade to Pro or wait for the next billing cycle.
Phone number format
Store numbers as +905XXXXXXXXX. Leading zero or spaces break delivery.
International numbers depend on plan. TR-only by default outside Enterprise.
Template and segments
Messages over 160 chars bill multiple segments; second segment may delay. Shorten URLs.
Carrier spam filters block aggressive copy, avoid ALL CAPS and link dumps.
DND and scheduling
Do Not Disturb 22:00–08:00 defers reminders; they flush at 08:00.
Instant booking confirmations bypass DND, only marketing messages defer.
Test and support
Send Settings → Notifications → Test SMS to your own number. If test works, the guest number is wrong.
For persistent carrier failures, open a ticket with SMS log ID.