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Received my iPhone 12 Mini today. No iMessage notifications, messages on other devices received before today are not on the new phone. Airmail 4 sounds not working. Apart from that, the phone is great and a huge upgrade from my clapped out iPhone 6.
 
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I solved the issue on my 12 Pro by downloading the Verizon Message+ app and then deleting all the text off their server. Since then, no missed texts for the last 6 days.
Are you stuck using the Verizon app then or did you just download it, set it up, delete all texts within the app, and then go back to using the Apple messages app? I may need to try this.
 
This has been happening to me for a few months, started on my iPhone 11 Pro. Ironically this hasn’t seemed to happen since upgrading to 12 Pro. But while it was occurring it was extremely frustrating, many missed iMessages that would not alert me when sent causing some hurt feelings among friends and family.
 
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I saw it happen today on my iPhone 12 Pro Max. I went into Messages in Settings, and re-enabled my phone number for "can receive messages at". Now it works.
I'm on T-Mobile and this worked for me! Thanks!!!
 
i think i had this happen 1-2 weeks ago on my SE2, standalone message.
 
Since I got my 12 Pro, and updated to 14.2 when available, no issues.

I'm not a huge message user but they have been coming through fine, making my Xiaomi Mi Band alert and alerting on phone.

On Three in the UK.
 
SMS is much worse in that respect. Very insecure.
Precisely! I’ve no idea why people in North America persist in using the unreliable and unencrypted messaging protocols of SMS/MMS for cross-iOS/Android conversations. Sure, for conversations between Apple users, use the Messages app for the wonderful iMessage. But why not switch to a 3rd party end-to-end encrypted service for all those green bubbles? And I don’t mean any of the apps owned by Fakebook Inc. Signal is a great app with seamless iPhone, iPad and desktop support, and you can even create a group and share a link with people to sign up. It’ll take a little effort to migrate some groups across, but wouldn’t it be worth it for a rich, reliable and secure messaging experience with your Android-loving friends?
 
Precisely! I’ve no idea why people in North America persist in using the unreliable and unencrypted messaging protocols of SMS/MMS for cross-iOS/Android conversations. Sure, for conversations between Apple users, use the Messages app for the wonderful iMessage. But why not switch to a 3rd party end-to-end encrypted service for all those green bubbles? And I don’t mean any of the apps owned by Fakebook Inc. Signal is a great app with seamless iPhone, iPad and desktop support, and you can even create a group and share a link with people to sign up. It’ll take a little effort to migrate some groups across, but wouldn’t it be worth it for a rich, reliable and secure messaging experience with your Android-loving friends?
If we all did this Apple would take note!
 
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Are you stuck using the Verizon app then or did you just download it, set it up, delete all texts within the app, and then go back to using the Apple messages app? I may need to try this.
After deleting all the texts off their server, I went back to using the Apple Message app. All the messages arrive without issue in the Apple app.
 
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So I recently got a new 16" Macbook Pro and had the same problem with the Big Sur + iOS 14 combo.

Apparently, forwarding SMS to a device is a new setting that will need to be turned on, as it is not turned on automatically.

In you phone, go to Settings > Messages > Text Message Forwarding and check and see if your new phone is one of the listed devices. If it's not, add it and you should be getting SMS texts. This also applies to any new laptops or Macs you get where you want SMS.
 
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Only the ones who are not aware or don’t care about data privacy.
No personal offense, but there is never a reason to choose Zuckerberg, ever.
Just for the record, I am absolutely not a fan of WhatsApp and I do very much care about privacy. I do not have a facebook account. My statement was just what I have observed from my contacts. More and more, people send me messages on WhatsApp instead of text. I always prefer text, but I have gotten complaints, especially from Android users, that my texts arrive at odd hours of the night, which is not when I sent them. Nowadays, I find that Android users among my contacts seem to prefer WhatsApp even for making phone calls, because the call quality is better.

If it were for me, I would not even use WhatsApp. I downloaded it for the first time only 2 years ago and it is something that was forced by circumstance (I had some health issues and family from abroad wanted a way to reach me).
 
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Precisely! I’ve no idea why people in North America persist in using the unreliable and unencrypted messaging protocols of SMS/MMS for cross-iOS/Android conversations. Sure, for conversations between Apple users, use the Messages app for the wonderful iMessage. But why not switch to a 3rd party end-to-end encrypted service for all those green bubbles? And I don’t mean any of the apps owned by Fakebook Inc. Signal is a great app with seamless iPhone, iPad and desktop support, and you can even create a group and share a link with people to sign up. It’ll take a little effort to migrate some groups across, but wouldn’t it be worth it for a rich, reliable and secure messaging experience with your Android-loving friends?
The answer appears simple to me - everyone knows everyone can receive SMS and all you need to know is the phone number.

If you introduce Signal (about which I have read good things - even got it installed on something) or other messaging app, people need to know they need to use that. And might need to use an ID other the phone number.

For occasional things like "Don't forget the milk" and "I'll be ten minutes late", almost everything other than SMS seems too much effort.
 
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It surprises me how many people are saying it’s an issue with SMS messages.
Everyone I chat with in the messages app is on iMessage and I’m getting missed notifications multiple times a day.
 
I think it is an iOS issue. Lost notifications of messengers apps for WhatsApp, iMessage, FB Message, etc. I did a network reset and iMessage seems fixed now. I had to delete and reinstall the rest. We will see how long this fix lasts though.
 
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Received my iPhone 12 Mini today. No iMessage notifications, messages on other devices received before today are not on the new phone. Airmail 4 sounds not working. Apart from that, the phone is great and a huge upgrade from my clapped out iPhone 6.
Turn off iMessage on all of your devices and switch off/reboot all devices. Then, turn on iMessage on your iPhone first, and ensure the service is fully activated and that new messages are set to send from your phone number, rather than an email address. Next, turn back on iMessage on your iPad, Mac, etc. This should help everything synch better.
 
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When the native mail app became glitchy in iOS 13 and had intermittent notifications/mails many folks on MR said “what’s so important that you need to get mail notifications? Just live with it.” I guess the same question can now be asked: what’s so important with messages that they need to receive it reliably?
 
I have missed some texts in a work message group that has a mix of iPhones and androids. I’m on Xfinity mobile using the Verizon network. Problem started with 12 Pro and iOS 14.1.
I also am missing some text message notifications from android users.
 
When I first got the iPhone 12 Pro on launch day, I wasn't getting SMS messages or visual voicemail notifications and couldn't enable Wifi calling. I talked to support for my carrier (Cricket, an AT&T subsidiary) and they "reset" my SIM, which allowed a flood of missed SMS messages to come in. But they stopped coming in again 5 minutes later. I put in 2 support tickets with them. The Wifi calling one, they closed because "they could not get ahold of me" which came in the form of a voice mail that I never saw because Visual Voicemail wasn't working. For SMS they tried to have me troubleshoot for about 20 minutes and nothing they suggested worked, all random codes they gave me to try in the phone app returned errors.

Regarding the SMS situation, I had to drive about 5 hours to wedding the next day. Once I was an hour from home, I suddenly got a flood of all of the messages I missed. Everything continued to work fine while I was away, and when I got back home the next day it continued to work and has worked since. I have no idea if it was carrier issue that they fixed on their end, or if traveling far enough hopped me between enough cell towers that the phone or network figured out its own problem.

Wifi calling ended up getting fixed by the carrier 2 days after launch and I've had it enabled since then.


In summary I had the SMS problem mentioned in the OP at launch, it went away somehow when I was maybe 50 miles from home. Since getting the two problems above solved, I haven't had any problems and the phone has been great. Battery life is better than the 3 year old Qualcomm iPhone X I replaced, and even cell reception is better. On the X I always saw 1 bar sitting at my desk at home, it's almost always 2 bars on the iPhone 12 when I randomly check it now and I can get full signal standing by my window.
 
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