File complaint and get your sim.
May be someone used your mobile and geabbed your barcode. If you are desperate then seriously file a complaint. 1st ask who used barcode and ask them to guide you for this thief.
Who to file a complaint with?
Nobody uses my phone except me, its locked with fingerprint.
2ndly, what about whether a is sim bound to a specific device after being activated?
15 days now.. u will get a message