Clear Defaults not Operational?

pmdied

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Nov 18, 2009
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I've been trying to use Dialer One as my default dialer when launching but it seems to go straight to the standard dialer. The instructions from the dev are:
Settings -> Applications -> Manage applications -> find standard contact appliaction, select it, press "Clear defaults" button.
Then press green call button in appeared dialog choose Dialer One and check "Use as defaults" option

But I noticed the the Clear Default button on "standard contact app" and most other apps is grey and non functional.
Is this a normal thing or is it a bug in the leaked 2.1 ROM?
Or am I just missing something? Are all dialer replacements unable to be changed to the default dialer?