If a phone is not compatible with the usual networks in another country, it is most likely a second generation device . In the case of the Spanish, all these devices use GSM technology, which is the dominant standard in Europe. But in the United States, second-generation telephones are based on another cellular communication system known as CDMA (GSM has been a very minority there). If you do not have a phone compatible with both networks or a third-generation phone that uses UMTS technology, compatibility is impossible.
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