The POP or IMAP protocols are related to the fact as to whether users wish to keep the changes and modifications that they do in their local system restricted to the system which they use, or wish the changes to persist in the Gmail server so that they could see the same in any other platform or system. Users have at times complained of this fact wherein the changes that they do to their settings, profile etc. do not appear in any other platform where they login. This is primarily due to the fact that the platform is using the POP protocol which needs to be changed to IMAP.
contact Gmail customer care support number 1-888-470-9705