1. I don't know how to see if it has dual band. Palm Spain says UMTS/HSDPA with EDGE/GSM.
2. Factory warranty in Spain is 2 years, I send the original invoice to the buyers.

bennish, warranty is offered by Palm Spain. I'm not a shop. I don't understand very good you want to know (my English is not very good). You can put in it any sim you want.

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