[budhabong]

Took me a while but its very simple,

follow this instructions step by step, don't wander off to look at other menu options, it could mess up your phone baddly.

first enter

##00**83786633* +SEND

"00000" is the code

in that menu go to test mode and Activate(enable) field test mode

after that exit all menus and go back to the Home screen,

Now your "field test mode" menu is enable

Now enter ##* +SEND to enter "Field Test Mode"

Go to Field Test Menu (option "B")

(don't get distracted, "GPS DOESN'T WORK", moto Q and Q9m have aGPS, its a fake GPS chip for 911 location only)

NOW go down to HDR Preference: Automatic (option "E")
and select your preference

Automatic: Default, switches between evdo and cdma

CDMA Only: stops data calls

EVDO Only: Stops any voice Calls except data, (excellent for faster broadband speeds when using your phone as a modem)

Exit the menu and there you have it.

Just make sure if your are using EVDO Only for modem use, to restore it back to automatic if you want to receive calls again. only enter ##* +SEND to enter the menu again.