If you purchased it with a new 2 year agreement, you wouldn't be able to get the 2 year agreement pricing discount on a new iphone until March of 2016 but you will always have the option to get one used or new at full price.
I am so happy to hear that you are interested in upgrading your line! You can check your upgrade date by dialing #UPG from your cellphone. This date will be the next available date that you are allowed to purchase new equipment at the 2 year discount pricing on your line.
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