I am having problems with my S4 and its headset. I have the Smart Cover and when open and unlocked my BT Headset works fine but as soon as i put a pass code on or close the cover i cant make calls. this is the same with the wired (included) head phones. Has anyone got a workaround or know if this can be changed in settings. the same BT Headset works fine with my old iphone and activates siri with one touch even if the phone is locked.
Also does anyone else on EE have problems with their sim card not working in the S4