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Well technically none of the Sprint cabs are strictly necessary for the phone to work either. Same as Verizon--you must already have the nvm in your phone provisioned and you have to set up the #777 connection manually, blah blah blah.
What I think is meant by necessary is the ones that set up your phone functions and data connection according to how it should be set up on your carrier (hence the different ## codes, etc.). Also, at least on Sprint you need the certificate cabs or else you're going to have problems installing apps.
So hopefully knowledgable people from the other carriers can step up here and identify what in their extrom is necessary (using the definition above). Otherwise I can go through 'em with cab manager and figure it out.
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