I have a APLINE GREEN 128G 13 pro max that I originally purchased from Verizon wireless. I've switched to Tmobile carrier. My ex boyfriend stole my phone, put his AT&T PREPAID sim card into my iPhone and is using like no problem. Bc the phone was not purchased thru tmobile so they can't block the imei.. AT&T had to do soo. I want my phone blocked with NO ACCESS. What can I do???