Cell phones in the US use GSM 1900 or CDMA 800, operating on different frequencies from systems in other countries. The only foreign phones that will work in the US are tri-band models, operating on GSM 1900 or other frequencies. If you have a GSM tri-band phone, check with your service provider about using it in the US, but beware that calls will be more expensive than using your home network (because of the US service provider's charges). Your mobile phone number stays the same, and callers at home will be connected to your phone automatically.
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