Yoonie,
I didn't know the importance was being placed on the unlimited data plan and not keeping the number. In fact, I don't think the situation will be able to play out like you've described above. In order to upgrade to a new phone, you need to sign a new 2-year contract. So, the most straightforward process would be:
- Upgrade to the Atrix (with new 2-year contract).
- Opt to grandfather your current data plan.
- Transfer your service to the family plan.
You will not be able to port your number to GV in this process because you need to sign a new 2-year contract. GV is pretty awesome and it would be nice to be able to use it, but you can only do it if you're willing to terminate your current service, which you are not due to the unlimited data you would like to retain.
Any other thoughts or suggestions from people?