Questions on upgrading with Verizon?

As far as I know if you use your upgrade than that will change you to the share everything plan. If you buy the phone at retail cost than you can stay with your unlimited plan.

 

If you use the upgrade, than you will lose unlimited data but can keep your existing plan with the tiered data plan. You don't have to go to share everything plan. But you must go to a corporate verizon store only to keep currently plan with tiered data. The only way to keep unlimited data is to buy the phone at full price and not be on contract.

 

Unless you buy the phone at full retail cost you will loose your Unlimited Data plan. I just upgraded my iPhone 4 with Unlimited to an iPhone 5 and I lost my Unlimited data because I hadn't bought my phone completely outright. So if you are willing to spend the $500-600 outright then you can keep it.

 

If you buy it at full price and then activate it, you won't lose unlimited. If you upgrade to it at a subsidized price, you will lose it.