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Dial ##33284#
Hit Send (green key)
Menu
B (Field Test Menu)
E (HDR Preference)
CDMA Only
I do not know if it survives a soft-rest.
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Side note: your plan does not change based on EvDo availability.
I do not know why you want to do this. Sprint cannot tell if you are on a Vision plan accessing EvDO. I know b/c I had a grandfathered $10 Vision account and used EvDO since the 6700 came out.
It's all data to them. No need to force 1x as you won't be charged any data fees if you use EvDO and there is no need to change your plan.
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