I did not return the charger with the phone that was being returned and replaced, I have called the warranty people twice about returning the charger and have received two different answers, the first call was before I mailed the phone back asking what all should be sent back as the only thing on the packing slip was numbers, I got an I don't know what those numbers represent. I am afraid that they will place a charge on my credit card.
Oh, I see. I'm assuming you have Extended Warranty, so I would call them again and tell them you weren't sure what to return and you forgot to include charger. (They usually want original package returned) They should advise you what to do next and they might send you another return mailer.