[Verizon HTC One (M7)] mardoon:
Here is what I found. https://www.dropbox.com/help/249/en

Is my HTC phone eligible for the special promotion?

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If you have a brand new HTC phone with Dropbox already installed, you may be eligible to earn additional free space simply by signing in to your account (or creating a new account) from the Dropbox app and completing the steps on our Get Started guide from your desktop computer.

HTC Sense 3.5 and 3.6 phones may be eligible for 3 GB for one year.

HTC Sense 4.0, Sense 4+, and Sense 5.0 phones may be eligible for 23 GB for two years.

Once you qualify for the promotion and complete the Get Started guide, your free bonus space will be automatically added to your Dropbox space, plus an additional 250 MB for completing the Get Started steps. Additionally, each account is only able to claim this promotion once.

U.S. AT&T and Verizon customers

Select carriers have opted-out of the promotion on phones otherwise eligible. Unfortunately, AT&T and Verizon are among those carriers not currently participating.

For our advanced users

To find out what version of the HTC Sense you're running:

Slide the Notifications panel down and tap Settings (or tap the hardware menu button and tap Settings on Sense 3.5).

Go to About > Software Information > HTC Sense Version.

Promotion details

For HTC smartphones with HTC Sense 4.0, 4+, and 5.0, the promotion is available to the first user who (a) registers for Dropbox through the on-boarding experience on an HTC Sense 4.0, 4+, or 5.0 smartphone pre-loaded with the Dropbox application and (b) completes Dropbox’s "Get Started" guide. The promotion is for a single Dropbox personal plan account to receive, for 2 years, an additional 23 GB of storage space in addition to the storage space Dropbox offers to users with a free account (currently 2 GB). Each user is only eligible for one promotion of this type for a single account. When the 2-year promotion period ends, the 23 GB of promotional space added to the user's Dropbox service will be automatically removed. Use of Dropbox is subject to the Dropbox Terms of Service, Privacy Policy, and other terms available at http://www.dropbox.com/terms. Promotion not available in China. For HTC Sense 4.0 smartphones, promotion expires December 31, 2013. For HTC Sense 4+ smartphones, promotion expires June 30, 2014. For HTC Sense 5.0 smartphones, promotion expires December 31, 2014.

For HTC smartphones with HTC Sense 3.5 or 3.6, the promotion is available to the first user who (a) registers for Dropbox through the HTC Sense 3.5 or 3.6 smartphone pre-loaded with the Dropbox application and (b) completes Dropbox's "Get Started" guide. The promotion is for a single Dropbox personal plan account to receive, for 1 year, an additional 3 GB of storage space in addition to the storage space Dropbox offers to users with a free account (currently 2 GB). When the 1-year promotion period ends, the 3 GB of promotional space added to the user's Dropbox service will be automatically removed. Use of Dropbox is subject to the Dropbox Terms of Service, Privacy Policy, and other terms available at http://www.dropbox.com/terms. Promotion not available in China. Promotion expires December 31, 2012.