Mobile upgrade.

Hi team,

In Deloitte USI we have a mobile upgrade after 2 years right which we buy a new mobile and they reset the old one and give to us. So currently there only one month left for me for completing the two years, but i can see upgrade button in mytechnology If I go for upgrade now will they give me the old device or will take it. Suggest me if shall I upgrade now or do I get any mails after a month which completes my 2 years?