Forgive me if this has been asked before. We have an old Alltel plan with 2 smart phones and 2 feature phones. The feature phone line has an eligible upgrade, so can you use the feature phone line to get a smartphone at subsidized price, then switch that line back to the feature phone, and activate the new smartphone on the line you're actually wanting to upgrade and therefore keep unlimited data since you aren't actually using the smartphone lines' upgrade? Or is that not how things work?