Can I switch from an iPhone 4S to a droid dna and keep my unlimited data?

I have an iPhone 4S and I was thinking about buying the droid dna on eBay. But I was wondering since the droid dna is a 4G phone, and my iphone is 3G, will I be able to keep my unlimited data if I switch?

Depends on which plans your provider has for a 4g device. Sorry I couldn't help more but you left out who your provider is. Hope this helps.