Detect unusual 3G to 2G downgrade attempts

Created by: andr3jx

I propose to add an option to change preferred network type to "WCDMA only" (3G). This can be done at least in the hidden Android Testing menu. After you change this option you need to disable and enable the radio again. This should prevent downgrading attacks from IMSI Catchers. In case a user can't do without 2G: We should record which networks support 3G. If the phone has good signal and the network offers only 2G (known to support 3G) the user should get a warning.

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