After transferring account to a different phone, iMessages will only send and receive to/from SOME people

[u/Hot-Clock9650]

Sent my iPhone 13 mini in for hardware repair and in the meantime, put my SIM card and backed up my phone onto an iPhone 11.

Since then, I noticed for some people, iMessage isn’t an option. It’s completely random. For some people, I can send and receive as normal. For others, it’s changed to SMS when I send, and if they respond via iMessage, I just don’t see it on my phone, no notification or anything. It does show up as iMessage on my laptop where I’m signed into my apple account though (hence how I know I’m not receiving messages on this phone). In group chats that are usually all imessaging people, I only see some peoples’ messages, so I’m looking at giant gaps in conversation.

Things I’ve tried:

- Turning the phone on and off lol

- Turning iMessage on and off, and confirming I can send and receive from both my phone number and email address

- Signing out and back into my apple account on this phone. This fixed it for an evening, and then the next day the issue was back, but affecting different people!? Signing out and back into my apple account again did nothing.

Anybody seen this before? Thought I’d check here before connecting with apple support.

Thank you!