
The deal ends a three-year dispute. In 2006, Vodafone ended a tie to Carphone and switched to an exclusive agreement with rival Phones4U, which committed to signing up 30,000 Vodafone customers a month.
Carphone's shares fell 14% on the day the contract loss was announced, with analysts estimating the chain could lose about £20m of annual earnings.
Phones 4u insisted that its relationship with Vodafone was still secure. MD Brendan Sweeney said it had a new 'multi-year' partnership in place.