Sprint uses 1900 MHz; Verizon uses mostly 800 MHz and the Treo 300 is a single band (1900 MHz), so there are very few times that a Treo 300 could work on Verizon.
Verizon is CDMA 800 and your Treo is only single band PCS (1900 MHz). You can roam on Cricket, Northcoast and other CDMA 1900 carriers and even on Verizon in Florida but most Verizon markets are not accessible to your phone.
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Treo 750 w/Cingular
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