Messages app on my iPhone 12 Pro keeps freezing

Hi 604kar,

welcome to the Apple (user-to-user) Community!

Re: Messages app on my iPhone 12 Pro keeps freezing

Wondering if your iPhone is short on memory / storage space: (iPhone usually needs around 8 Gb free in which to operate smoothly: See: How to check the storage on your iPhone and iPad - Apple Support

If needed:

It is wise to back up your iPhone data before making space available.

Else:

Apple support has trouble-shooting articles online (links below) that may be helpful:

If your iOS or iPadOS device freezes or has performance issues, you might want to try these tips

What to do: If your iPhone or iPad is running slow - Apple Support

Eg: says:

"If the network that you're connected to is congested — for example, at an event with many people using

the same network — apps might take a while to open or display their content"

or

see what to do:

If an app on your iPhone or iPad stops responding, closes unexpectedly, or won’t open - Apple Support

Eg: says: Close and reopen the app

Force the app to close. Then open the app to see if it works

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Re: also fails to send imessages in group chats

You may need to enable cellular data for sending SMS / MMS to Android users

See: Send a group text message on your iPhone or iPad - Apple Support for tips

and

You may want to: Learn more about the difference between the message types.

What is the difference between iMessage, RCS, and SMS/MMS? - Apple Support

All the best :-)