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Manufacturer: Microsoft
Model Name/Number: 1800-2b (RM-669)
Technologies and Bands:
(2G)
GSM: 850 MHz   1900 MHz  
Certification DateHardware VersionSoftware Version
2011-05-270102, 500006.51
2011-05-040102, 500006.50
2011-03-310102, 50006.40
2010-12-210102, 500006.20
2010-08-11010205.80
2010-08-04010205.36
2010-06-17010205.35
2010-06-10010205.00

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