User level: Level 1 (4 points)whenever I get an automated message, to confirm an appointment, from many different senders, I respond with yes or allow or whatever, and It says, NOT DELIVERED. all the time. Anyone know what to do? this is on all devices.
Posted on Sep 19, 2026 11:06 AM
User level: Level 6 (12,236 points)Sep 19, 2026 1:07 PM in response to nancy72
If this happens with automated messages from several unrelated senders and on all your devices, I’d check with your cellular carrier first.
Those replies are often sent to short codes rather than normal phone numbers. If your carrier is blocking short-code SMS or premium/automated messaging, the reply can fail even though you receive the original message.
If one of the messages specifically asks you to reply YES, tap the red Not Delivered alert and see whether it gives any additional error. That would help narrow down whether this is a carrier/SMS issue rather than an iMessage problem.
Originally posted at discussions.apple.com/thread/256360644