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I am in this same boat. I have an unlimited data plan for my non-smartphone, but AT&T detects the M8 and adds a data plan. I need to constantly switch SIMs into the non-smartphone and call AT&T to switch back to data unlimited. If you have a true SMARTPHONE unlimited plan, they will grandfather you. If the unlimited plan is for a non-smartphone, you're gambling that they don't switch you.
Sorry, there was a problem. Please try again later.As long as you don't change your phone number or your data plan (i.e., to a share plan) then you will not lose the unlimited data. That's what we were told and we've upgraded our phones a few times now.
Sorry, there was a problem. Please try again later.You don't have to if you don't want to. Just tell the Best Buy sales rep that you DO NOT want to change your plan because you'll lose it. They'll be more than happy to help & start the upgrade process.
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