I need some help. I can't use Guest Mode on my LG G3 because the avatar profile picture for myself doesn't show on the Quick Settings pull down bar, which makes it impossible for me to switch between myself and the Guest account. I'm logged into both GMail and Google+ with Keep contacts up to date checked under Settings, Account Settings (my GMail account), Contacts. But still no luck. Any help would be very appreciated. Thanks.
I figured this out. The LG G3 does not allow you to create multiple users on it. That's why a profile picture from Google+ doesn't show, which would allow you to add users, switch to a different user, etc. The LG G3 only allows you to use the 1 Guest User account already on the phone in addition to your own.
That is bizarre - even the demo video with Lollipop on the LG G3 with an early version shows the multi-user version working before our eyes and that is all over the Internet. The word is anything the LG Engineers didn't debug got pulled at the last second. The hope is they fix it in an update. The carriers like Sprint need to lean on them to fix it.