Appointment reminders, drip campaigns, delayed notifications — scheduling an SMS in advance is simpler than most platforms make it look.
Sending a text message the instant you write it is the default everywhere. Sending one at exactly the right moment later — an appointment reminder the morning of, a renewal notice three days before it is due — is what actually drives replies and reduces no-shows, and it should not require a separate scheduling tool bolted on top of your SMS platform.
6X Scheduled SMS adds one field — send_at — to the same send request you already use. Nothing is billed until the message actually goes out, every pending message is listed and cancellable, and delivery works exactly like a normal send.
See how it works: 6xcom.com/scheduled-sms.