I have an interesting predicament. Currently I am on my aunts plan, which is not yet a share everything plan. I have 4 GB of data from a promotion awhile back, and 700 minutes or so. But now I need to move to my parents plan. Is there anyway I can just move my exact contract now to my parents plan, or does it have to be a share everything? In addition, I'm getting an upgrade sometime this month, when is the best time to do that (before or after the switch)? Thank you!
Personally, I would perform the upgrade prior to changing to the new account.
If you are moving to your parent's plan, they would have to perform an AOL(assumption of liability) for your line. Your aunt may have to be present to release the line.
Do your parents currently have a Share Everything plan? If so, you will have to switch to the Share Everything plan. If your parents currently have a Family Share plan, you would be able to add your line to their plan.
I am unsure if the double data deal you currently have would transfer over to another account, but it may.