BARCELONA — AT&T Inc. is scoring a win over rival ­Verizon Wireless as it takes over the contract to supply wireless connections to cars with General Motors’ OnStar service.

Verizon Wireless and its predecessor companies have supplied the network for OnStar­ since the service was launched in the 1990s, but AT&T will take over with the 2015 model year, AT&T and GM said Monday.