A non-activated old Droid I have is ringing and taking calls instead of my activated LG G2.

[AC Question]

My son uses my old Droid Razr just on our Wifi. It has not been activated in years. Today, my LG G2 lit up like it was receiving a call, but I could not answer the call. The Razr also started ringing and the call came through. I am not able to make or receive calls on my LG, but magically it appears the old Razr is now activated. Texts still come and go through the LG phone, just calls are coming in on the old Razr. He has a separate Google account that it runs on so I'm not sure how they got linked. Any help would be appreciated. Thanks!