My employer will supply an AT&T contract for me (unlimited usage on everything), but I have to get an iPhone. I don't want an iPhone. I'd rather buy a Nexus 4 with my own money, get the company-negotiated contract, and put the SIM in the Nexus 4. Does anyone know if this SIM swap will throw any yellow flags in the system? i.e. what information, other than my number and subscription information does a SIM carry? Just curious.