Why is com.sec.vsim.ericssonnsds.webapp showing up in my google activity?

Someone stole my phone on November 23, 2018 and all of a sudden this com.sec.vsim.ericssonnsds.webapp showed up on my Google activity and I dont know what it means. This is also showing up as well com.ws.dm, and I dont know what it means either. And so is this showing up as well, com.sec.unifiedwfc. All of these activities are showing up on the same day that my phone was stolen on, November 23, 2018. Please help!!

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