Question about RETAIL return policy.

[Teufel Hunden]

If I were to buy a phone at the retail price without a contract upgrade or extension, would I still be able to utilize the 30 day return policy, or even the exchange?

Also, what if I were to buy the phone from Walmart for retail, would this change anything?

Thanks in advance, I am really looking forward to an android phone but have serious "next big phone" issues...