The Toldos Aharon Rebbe appointed a committee in charge of the Ruchniyos of the Chasidus and one of the the things he said was that if they find a non-kosher phone on Shabbos they can be מחלל שבת to destroy it. He also said that the destroyers would not have to pay for the destroyed phone.
I can understand the feeling that non-kosher phones are a bad thing and the desire to get rid of them from his chasidim, but how can he allow chillul shabbos to do that? What good is it to be a kannoi if you are violating halacha?
The Chazon Ish once commented on the Kannoim in Yerushalayim that they
were pre-matan torah Jews, meaning that their actions were not guided
by torah but by emotion. This is a very bad thing which leads people to
do terrible aveiros and to be matir chillul shabbos.
Source: האדמור מתוא"י: "נפצו טלפונים לא כשרים גם בשבת"