Do you mean the Motorola RAZR2 V8 released in 2007? https://www.gsmarena.com/motorola_razr2_v8-1991.php
I don't think there's any practical way to use it on any US network today. If you try to officially activate it, it will fail, because it doesn't have VoLTE / HD Voice technology.
The only small possibility would be to swap in a T-Mobile SIM card, but even if that would work, there's so little of the 2G network remaining, I don't think it would work well.
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