Be in an HD Voice coverage area

Use an HD Voice-capable smartphone

Have AT&T PREPAID SM or wireless service set up for HD Voice

or wireless service set up for HD Voice Have the HD Voice SIM card that came with the device

Voice dialing

OfficeDirect and OfficeReach for business accounts

With AT&T HD Voice, you enjoy a higher level of voice quality when you make and receive calls. The key is wide-band audio technology and noise cancellation on our network. To get HD Voice,must:Activate the SIM that comes with your new smartphone to make sure all supported features work properly. If you use another SIM with your HD Voice device, some phone features may not work. Have an unlocked device? Find out if it’ll accommodate HD Voice (PDF, 150KB) AT&T HD Voice requires a SIM card that is UICC-G or higher SIM card installed in your smartphone to enjoy the rich calling experience of AT&T HD Voice. Want to make sure to find out if your SIM card is HD Voice compatible? In the SIM card number, look for the digitsor higher in the 9th and 10th positions.Don't have a compatible SIM card? Get one at an AT&T store Some features and services aren’t compatible with HD Voice, like:If you have an AT&T HD Voice smartphone and one of these incompatible features, you can choose between using HD Voice or the incompatible feature during the set-up process. We'll remove these features from your line once you add HD Voice.