How To Leave A Group Chat On iPhone
Group chatscan be a useful tool for making plans with several people at a time, organizing events, and keeping family members in the loop in one central place. It gives you and those who are a part of the chat a way to send messages for everyone to see without the need to relay information between multiple parties (like an old game of telephone, if you will). However, there will likely come a time when you decide you need to drop out of a particular group chat.
Maybe something came up and you may’t make it to the event everyone is attending, so you have no reason to hang around. Perhaps you simply don’t want to be in the chat anymore, or the sporadic notifications are becoming a nuisance.

Whatever the reason, if you decide it’s time to bow out of an iPhone group chat for any reason you have a couple of different options available—though depending on the circumstances it may not be possible to leave completely.
Muting a group chat
In the event that you don’t want to exit the group chat entirely but are tired of being inundated at a particular time, there is an alternative: Muting it. This will keep you in the chat but prevent notifications about new messages and other activity.
Once a chat has been muted you may un-mute it by following the same steps. Muted conversations will display either an icon of a bell with a slash through it in iOS 15 and newer, or a crescent moon in iOS 14 and older.

How to leave group chats
It’s also possible that you have no reason to remain in a group chat, or that you have one of any number of other reasons for wanting to leave it. In which case:
Be aware that leaving group chats is only possible if everyone in the thread is using iMessage on an Apple device. If one or more of the people included is using something else, you won’t have the option to leave the chat. You’ll need to mute the conversation instead (see above).