If you do an Assumption of Liability (AOL), that means that someone else is taking over your lines; so I'm confused why you wonder if you'd be able to keep all the upgrades and unlimited data "once the lines are switched". After the AOL is complete, the lines wouldn't be yours, they would belong to whoever took them over. Have you possibly confused an AOL with something else?
There are several recent threads about this on this forum, such as the one below, indicating that you may not be able to retain your unlimited data after an AOL:
Hi there Ducki!
You're a lucky ducky as I have the answers for you! I'm excited you've decided to take over this account into your responsibility! Your parents will be proud!
At this time, when processing an Assumption of Liability (AOL) you will be able to retain your upgrades and your unlimited data plan.
If you have any other questions, please don't hesitate to ask!
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I am being offered by my company to join their pooled minutes/data, etc and upgrade my device as well. I need to have my number taken off the family plan so that they can port my number over to the corporate account. How do I do this and what happens to the remaining numbers on the family plan? Is it easier to do it online or at the Verizon location near me? Thanks
You will likely want the company to do an AOL - that way there is no ETF when the phone is taken off your family plan. The remaining numbers on the family plan will have no change, there will be one less line to share minutes with, everything else will stay the same.
The change will initiate from your company's side - they will request the AOL and you will release the number to them.