I received a notification on my phone screen that another phone was logged into my iMessages, what does it mean?

[iMore Question]

i received a notification on my phone screen that another phone was logged into my imessages

what does that mean? how can i find out who it is?

 

[anon(5719825)]

Re: i received a notification on my phone screen that another phone was logged into my imessages

I would change your iCloud password now. That would prevent anyone if there is anyone else logged in from being able to use your account to view or send anything.