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The mobile phone provider 1&1 will switch all of its users to the Vodafone mobile network in the future. So far, a large part of the twelve million 1&1 customers have been on the Telefónica network, which was rented for use. As the 1&1 parent company United Internet announced, the company has now signed a binding preliminary contract with Vodafone for long-term and exclusive national roaming. For 1&1 this is a liberating blow – and 1&1 customers can also look forward to improvements.