The process will be different depending on the devices used by group members and the number of group members, as follows:
How to Leave a Group Where All Members Have iOS Devices
If all the group members have iOS devices, then the iMessage is being used for the group chat and a user can confirm the same if the text message bubbles are appearing in blue. Keep in mind that a user cannot leave a group created by himself. If the group’s notifications are in blue and the option to leave the group is greyed out, then check if there are more than three iPhone users left in the group after you leave the group, otherwise, add some members (fun fact: you can add yourself as another contact and leave the group) with iOS devices to leave the group.
Leave a Group Where Members are Using iOS and Android Devices
If the group message notifications are appearing in green, then there is at least one user in the group who is using an Android device. In such a case, the Leave This Conversation option may be greyed out and a user cannot leave the group (the issue is mutual, Android users may also fail to leave a group where at least one user is using an iOS device). A natural question comes to a user’s mind why can’t I leave a group chat in Messages? Basically, in this case, the SMS/MMS protocol of the cell phone’s carries is being used (beyond the control of Apple) and as per the communication standards, the group SMS/MMS is more a hack, than a feature. In which, the SMS/MMS is delivered as what and to whom basis, whereas, the group is just a visual arrangement of these messages. So, there is nothing to leave, and in this case, muting the group chat is a logical step. If that did not what you want, then you may try the following but it depends on the nuisance the group chat is creating:
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