Do Not Spam, Sell or Trade on XDA.
From the Forum Rules:
2.5 All members are expected to read and adhere to the XDA rules.
5. Create a thread or post a message only once.
As a large forum, we don't need unnecessary clutter. You're free to edit your message as you like, so if you do not receive an answer, revisit your message and see if you can describe your problem better. Not everyone is online at the same time so it might take a while before you receive an answer. (Also refer to Rule 16)
7. Do not spam, sell or trade on the forums.
If you wish to advertise a product, simply contact us. We can provide ads but you are not permitted to just post it in the forums. If you do, it will be removed and you're likely to receive a ban.
On the 30th Nov 2012 the Marketplace closed. The buying, selling, trading and / or exchanging of any item is now prohibited on XDA, in any forum or via Private Messages. We now use www.swappa.com
11. Don’t post with the intention of selling something.
Don’t use XDA to advertise your product or service. Proprietors of for-pay products or services, may use XDA to get feedback, provide beta access, or a free version of their product for XDA users and to offer support, but not to post with the intention of selling. This includes promoting sites similar / substantially similar to XDA-Developers.com.
Do not post press releases, announcements, links to trial software or commercial services, unless you’re posting an exclusive release for XDA-Developers.com.
Encouraging members to participate in forum activities on other phone related sites is prohibited.
Off-site downloads are permitted if the site is non-commercial and does not require registration.
Off-site downloads from sites requiring registration are NOT encouraged but may be permitted if both of the following conditions are met:
A) The site belongs to a member of XDA-Developers with at least 1500 posts and 2 years membership, who actively maintains an XDA-Developers support thread(s) / posts, related to the download.
B) The site is a relatively small, personal website without commercial advertising / links (i.e. not a competitor forum-based site with purposes and aims similar to those of XDA-Developers.com.)
13. Advertising and Income Generation
Commercial advertising, advertising referral links, pay-per-click links and other income generating methods are forbidden. Do not use XDA-Developers as a means to make money.