Re: T-Mobile Nexus One Insurance
Their system still uses an IMEI (ESN) number, so yes, they could flag it. The problem with GSM is that they could still take it to another carrier. For example, if someone stole your T-Mobile N1 and T-Mobile flagged it, they could take it to At&t and use it (Edge only of course). With CDMA, they're usually locked to the carrier unless they're able to flash it to something like MetroPCS or Cricket.
Your account info is on your SIM, but their system recognizes the IMEI, that's how they can change your data plan as soon as your SIM goes into a branded smartphone.
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