Ref: to the above Title, As far as I know GSM stand for Global System for Mobile
Nowadays we have in the markets many Mobile Telephone from all over the world
most of these mobile telephones mentioned in their manuals it is GSM but the do not
mention is it GSM 900 , GSM 1800 , GSM 1900 , Are all Mobile Telephones compatible
with the above GSM Bands ( 900 , 1800 ,1900 ) . 1.e TRI-BAND MOBILE TELEPHONES
Best Regards
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