A couple of conditions need to be met for iMessage to be delivered to the recipient’s phone.
The phone needs to be turned on.
iMessage needs to be enabled.
The phone needs to be connected to the internet (Wi-Fi or mobile data).
iMessage servers can’t deliver iMessage without any of the conditions mentioned above. If you have activated the “Send as an SMS” option on your phone, the message will be sent as an SMS. It will only say delivered when the recipient’s device goes back online. Otherwise, the iMessages will be stored on Apple servers for up to 30 days for redelivery.
Do iMessages go through if phone is off?
Now there will be times when you have signed in with your Apple ID on multiple Apple devices such as iPad, iPod, MacBook, iMac, or Apple Watch. In that case, your phone can be off and iMessage will say delivered to the sender.
For example, I have set up iMessage on my MacBook Pro. When someone texts me on iMessage I receive those messages on both my Mac and iPhone. My iPhone can be off or without a network connection and iMessages will still be delivered to my MacBook.
That may confuse the sender since he/she will think that I received the message, when in fact my phone’s been out of power for several hours. The sender may even think that you have blocked him/her, which is not the case. Here’s how to know if someone blocked you on iMessage.
Now, does iMessage still say delivered if phone is off? If the recipient’s phone is off, iMessage will not say delivered to the sender until the phone is powered back on. iMessage will only go through and says delivered if the recipient has other Apple devices with iMessage enabled.
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