As long as you keep the original software in case you need to take it into verizon ever I don't see why it'd really make any difference as to what base OS is used.
Currently for example mine is on sprint but shows the alltel logo (before that was the other aku 2.2 which would show telecom).
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PPC6700 w/ WinCE 6.5
w/ Radio 1.43
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