Yahoo (NSDQ: YHOO) and T-Mobile have struck a deal in which the search firm will provide display advertising on the network operator’s internet service Web ‘n’ walk in the UK.

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Reuters reports that Yahoo has been pushing into the mobile ad space aggressively, especially as rivals such as Google (NSDQ: GOOG) have made serious inroads into its core web search and advertising business. The partnership with T-Mobile follows a similar deal made with Vodafone (NYSE: VOD) and means that Yahoo now has access to two out of four of the UK’s top networks. Yahoo Europe’s VP of Connected Life Geraldine Wilson said that with the two operators on board the search firm now had “the kind of interesting scale of audience for advertisers to start considering this medium seriously.” Most of the advertising will consist of banner ads.