FaceTime video calls allow people to communicate using sign language without physically occupying the same space. Through the use of closed captions, supported in iOS and available on iTunes, those with hearing loss can fully immerse themselves in movies, television shows, Internet videos, and even podcasts. Text messaging, while not a new concept, has become more accessible and widely used. The iPhone also offers options for alerts that do not include sound. There are visual alerts, usually flashing LED lights, and vibrating alerts, of which one can even customize the pattern of. If someone has trouble hearing in one ear, they could miss part of what they are listening to if they have headphones on. Mono Audio puts all of the audio in either ear, so as not to miss any audio. iPhones are also compatible with several hearing aids, some of which can be managed from the iPhone itself