Hey Immarvie.
There could be quite a few things causing issues with receiving messages. The title of the post mentions that messages disappear but the body of the message doesn't reference that. To make sure we're on the same page here, are some messages disappearing in addition to others just not being received at all?
Here are some basic opening steps to try if you're not receiving messages on your iPhone:
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- Restart your device:
- Check your network connection. To send a message as iMessage or MMS, you need a cellular data or Wi-Fi connection. To send an SMS message, you need cellular network connection. If you turn on Wi-Fi Calling, you can send SMS messages over Wi-Fi.
- Check with your carrier to see if the type of message you’re trying to send, like MMS or SMS, is supported.
- If you’re trying to send group MMS messages on an iPhone, go to Settings > Messages and turn on MMS Messaging. If you don't see an option to turn on MMS Messaging or Group Messaging on your iPhone, then your carrier might not support this feature.
- Make sure that your device has enough space to receive images and videos.
- Make sure that you entered the correct phone number or email address for the contact. "
This info comes from If you can't send or receive messages on your iPhone, iPad, or iPod touch. Further down that same resource, there are more detailed steps to take based on what is happening specifically with those messages.
You also mentioned that some were texts. It's important to clarify that, as text messages, or SMS messages are sent through the carrier network, rather than iMessage messages which are not. What color are the bubbles that surround those messages? Blue would indicate iMessage conversations and green would indicate SMS/MMS messages.
Take care.