The deal between the pair includes a model for revenue sharing, but Orange isn't providing any details of how it works or the sums involved.
At first, the partnership will give Orange subscribers access to co-branded encyclopedia content, Orange said. This includes specific channels and links to Wikipedia information on Orange's mobile portals, and mobile widgets for access to Wikipedia content directly the mobile phone.
In general, the move to the mobile phone could open the door for more revenue opportunities for Web 2.0 brands, according to Paolo Pescatore, analyst at CCS Insight.
There is a bigger opportunity to understand the customer in the mobile space, and then monetise that via more relevant and targeted advertising, he said.
The deal also reflects how carriers are trying to differentiate themselves through partnerships with web 2.0 companies, according to Pescatore.
Ideally, users will be interested in the mobile versions of well-known sites, therefore increasing data traffic for the operators, Jessica Ekholm, principal research analyst at Gartner.
Last week Orange also extended its partnership with mobile-phone maker Nokia, which will result in a co-branded mobile email service called Nokia Messaging by Orange. It will be launched in the UK in July.
If operators don't sign deals with popular brands they run the risk of users bypassing them and going the straight to the websites via browsers. In such cases, the operators would miss revenue opportunities related to, for example, advertising, according to Pescatore.
See all mobile phone reviews