Hello kevinfromtaihape.
Thank you for using Apple Support Communities. It sounds like you're unable to receive MMS pictures on your iPone 11. You've also gone as far as to restore your device to factory settings to resolve this issue. However, when you restore from a backup, this issue returns. We can understand how this would be an issue.
You've also tested your SIM card on another device, and you're able to receive MMS pictures without any issues. We do have two helpful resources you can review below:
About iMessage and SMS/MMS - Apple Support
If you can't send or receive messages on your iPhone, iPad, or iPod touch - Apple Support
They both contain details and troubleshooting steps you can attempt. However, if you continue to experience this unique issue with your iPhone 11, it would be best to contact Apple Support for further assistance. Just in case, you can use the link below to reach them:
Get Support
We hope this information is useful. Cheers.