Originally Posted by penguin3107

What you want to do is not possible.
The 8830 is not offered by any GSM carriers in the US (At&t, or T-Mobile).
It doesn't support the GSM frequencies used by those carriers.
In the US, you can only use the 8830 as a CDMA device, either with Sprint or Verizon Wireless.

The SPrint 8830 supposedly comes unlokced, so you can use a European SIM card in it when you travel overseas.
The VZW 8830 is locked and will only accept a Verizon SIM card. So far, no one has been able to unlock the VZW 8830.