Is avast plain to have possibility to connect to the phone with the wifi and not only by data carrier?
I use Anti-Theft on tablet without sim (wi-fi only). And it works.
Do you mean Anti-Theft uses sim if it is present and don’t use wi-fi at all?
If so it would be good to make priority settings.
It do not work on my phone, and I have this message (sorry in french) :
It say anti-theft do’nt work without datas
http://nsa38.casimages.com/img/2015/05/06/mini_15050610144638213.png