family plan upgrade iphone3g ?

in iPhone edited January 2014
i currently have a family plan with 4 phones. i checked the att site and it says that i am elegible for upgrade.

i want to upgrade only MY number, and keep the other 3 numbers intact. does this mean i just buy the iphone and then add the data plan of $30 per month onto my existing family plan?(we share minutes)

also, i have a 1500 text msg plan right now. will i have to cancel that and get a new "iphone specific" text msg plan? or can that 1500 plan apply to my new iphone?

btw do i buy the iphone in att store or apple store?
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