I've searched and can't find the answer to this. I have grandfathered unlimited data. I have been to Target and Best Buy trying to upgrade my current iPhone 4s to a Samsung Galaxy S5. Both places have told me that the only way to keep my unlimited is to stay with iPhone. Yeah good luck getting an iPhone 6 right now, and I much prefer Android.
What I don't understand is WHY I have to lose my unlimited data when switching phones. Nothing else changes, and it's all the same smartphone plan. Is there a way to keep my unlimited data and upgrade to a different phone?