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Manufacturer: Sony Corporation
Model Name/Number: W20 (AAD-3880084-BV)
Technologies and Bands:
(3G)
UMTS FDD: Band I  
(2G)
GSM: 850 MHz   900 MHz   1800 MHz   1900 MHz  
Certification DateHardware VersionSoftware Version
2011-01-14AR7EA011
2010-11-24AR7DA066
2010-10-22AR7DA065
2010-10-06AR7DA063
2010-10-01AR7DA062
2010-09-28AR7DA058
2010-09-28AR7DA056
2010-09-28AR7DA054
2010-09-28AR7CA065
2010-09-23AR7DA052
2010-09-22AR7DA050
2010-07-15AR7CA064
2010-07-07AR7CA062
2010-07-07AR7CA061
2010-07-01AR7CA058
2010-07-01AR7CA057
2010-06-23AR7CA056

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