The release is not clear where the infringement is, but AFAIK the GSM compatibility is in the GSM modem. I dont know if Apple is liable if the infringement is

The release is not clear where the infringement is, but AFAIK the GSM compatibility is in the GSM modem. I dont know if Apple is liable if the infringement is by the modem in the iPhone since Apple doesnt make the modem, they buy it from another company.