Why iPhone needs a workaround
Unlike scheduled email, Apple's Messages app has no built-in "send later" button, so getting the same result on iPhone means setting up a short automation in Shortcuts rather than flipping a single setting.
A scheduled text still needs your phone
Scheduled messages generally send from your phone at the trigger time, so the phone needs to be powered on and connected to a network at that moment β if it is off or offline, the message will not go out until it reconnects, or may fail entirely.
Frequently Asked Questions
Will the message send if my phone is off at the scheduled time?
No β the phone generally needs to be on and connected to a network at the scheduled moment for the message to actually go out.
Can I cancel a scheduled text before it sends?
Yes, in most apps you can open the queued message and cancel or edit it any time before the scheduled send time arrives.