I was thinking of this: What if PM created a Special Sim that determined if a Handset was Comparable, NOT an actual Sim for Service necessarily, but to determine if a Handset is 110% Compatible.
This Test Sim would Not be Disposable, but reusable. Handy Tool to determine handset compatibility due to IMEI reader Impractability.
Something to think about, If This Concept Exists at all