I had to force 1x on my phone, since I live in a horrible location and my phone would jump back and forth between 1x and EVDO killing my battery in less than 4 hours. Looking around the interbutts, I found this tip. Works on our Diamonds and should work on every other phone.
It allows you to make a menu option for easy forcing of either type of phone connection. I do not take credit. I'm simply reposting
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Here is the Registry edit for enabling Hidden Phone Settings "Mode of Operation" option to pick 1X mode only.
HKLM\SOFTWARE\OEM\PhoneSetting
Change the option HiddenModeOperationPage from 1 to 0
Then go to Phone/menu/option/service/and check in the list, "Mode of Operation" should be at the bottom. You have 3 choices, Hybrid, EVDO, and 1X.
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http://forum.xda-developers.com/arch.../t-445859.html
haven't gotten to test battery differences... But it's working fully on 1x. I don't mind internet speed loss, since I barely use it.
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