You must have a quad or tri band phone and the reason to unlock it is so that you can use a non-proprietary SIM. SIM’s are only GSM, so I thought that was obvious.
Many of the smart phones Verizon sells are Quad band. I think it is done for marketing, in the sense that Verizon is clearly the most expensive of the three, so one does not stay with them to save money, but rather, when you call and need something (like an unlocked phone), they almost never say no.
I’ve been with T mobile, Sprint, ATT and finally Verizon and I can’t see ever going back to those others, though I did like the connections with Sprint.
Richard
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