Sprint and Verizon don't need to brick the phones since they are CDMA networks and once those phones are reported stolen they are essentially black-balled from the network any way. T-Mobile, AT&T, and all other sim-card services would have to figure out some type of alternative in safe-guarding stolen phones.
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Sprint and Verizon don't need to brick the phones since they are CDMA networks and once those phones are reported stolen they are essentially black-balled from the network any way. T-Mobile, AT&T, and all other sim-card services would have to figure out some type of alternative in safe-guarding stolen phones.