now that nextel and sprint are merging, i *think* you have 14 days to return it and cancel the contract because that's a sprint policy on new contracts, so if it's a new purchase make sure you are happy with it before 14 days is up! i called sprint to see about getting a different phone on the 16th day and it was tough luck for me, even though the new phone was more expensive and they would have been making money.
if nobody here is able to help you after a day or two, maybe you can take it to a sprint store? i dont know how close you are to one, but they could help you figure it out. or possibly call them, i have been very pleased with sprint's customer service, i hope nextel is as friendly and helpful as the sprint half.
remember with the holiday the forum might not have as much traffic as usual.
good luck, hope this helps!