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battery tip doesnt work anymore??

i was reading some articles about improving battery. one tip was to go to the dialer and do *#*#4636#*#* and wait and then it will take u to a screen where u go to phone info and hit menu and change the network from gsm to cdma. i tried this and when i entered the numbers into the dialer it didnt do anything. the thread was from june so does this not work anymore? thanks
 
There is a marketplace app called Network that does the same thing.




i was reading some articles about improving battery. one tip was to go to the dialer and do *#*#4636#*#* and wait and then it will take u to a screen where u go to phone info and hit menu and change the network from gsm to cdma. i tried this and when i entered the numbers into the dialer it didnt do anything. the thread was from june so does this not work anymore? thanks
 
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