Is it possible to replace parts or adjust the circuitry of a GSM cell phone (850/1900MHz) originally designed for the USA in order for it to be used overseas where the operating band is 900/1800MHz ? How prohibitive or complicated could it be for an average electronics technician?
If it's not a feasible process, are there at least good uses for parts taken out of the unconvertible phones for use in an almost similar phone model? (ex. Nokia 3290 parts for Nokia 3210)
Thanks for any information!