A client had his Galaxy S8+ stolen last weekend, he's allocated me the job of managing the process. As a final "up yours" to the thief, I want to get the handset blacklisted. Spark has a paragraph or two on blacklisting but no mention of actually how to do it. The service call rep I spoke to had no idea, the department she put me through to doesn't answer their phone - after 30 minutes I gave up on that idea. 

Is there a direct source for blacklisting a Spark on-account mobile? We have all the details on hand.