Good news for Nokia Lumia user who have already upgrade their Windows Phone OS to GDR2 code Amber ... but Field Test mode at GDR2 can not be access for force 3G only or WCDMA only ... at GDR3 , Nokia Lumia is possible to use for high speed internet with 3G/WCDMA only because Windows allow access Field Test at this new upgrade of Windows Phone. So we can force 3G/WCDMA only at Nokia Lumia with GDR3 Windows Phone OS.
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