HTC has had a trade-in program available for those purchasing the One smartphone. The program was originally unveiled back in mid-February and has since been given a few extensions. And well, it looks like HTC has once again extended the deadline. This latest brings the purchase date into the middle of May and the mail-in date up into the middle of June.

Specifically, the purchase date has been extended to May 19, 2013 and the mail-in date has been extended to June 19, 2013. In order to take advantage of this offer, those considering the purchase of a One will need to pre-register on the HTC website. Once pre-registered you will get a promo code along with some other details by email.

The long and short here, you basically buy the handset before May 19 and then head to and enter that promo code. From here you then need to mail your old smartphone to HTC before June 19. The $100 credit will come back in the form of a Visa gift card, which really just means that you will still need to shell out the full $199.99 on the day of purchase.

Otherwise, while HTC has the trade-in program available for the One, those who are considering a purchase with AT&T may want to check out their recently announced offer before committing. The AT&T trade-in program is also offering a $100, however it is available for any of the available AT&T smartphones. You know, just in case you decide to go with a GALAXY S 4 or LG Optimus G Pro.

[via phoneArena]