Can see data before I've installed the code into my site[ Edited ]
January 2016 - last edited January 2016
I've just installed GTM into my site but haven't created any tag.
Someway I can see several sessions in my GA account.
How could it be explained?
Morever, the developer even hasn't known UAID, so there is no chance he has installed GA code into the site.
Re: Can see data before I've installed the code into my site
You're receiving fake hits. It's called referral spam or ghost spam. Please check this great article about it:
Hope this helps.