Editing Smartphone (section)

===Sound===
Some audio quality enhancing features, such as [[Voice over LTE]] and [[HD Voice]] have appeared and are often available on newer smartphones. Sound quality can remain a problem due to the design of the phone, the quality of the cellular network and compression algorithms used in [[long-distance call]]s.<ref>{{cite web|url=https://spectrum.ieee.org/why-mobile-voice-quality-still-stinksand-how-to-fix-it|title=Why Mobile Voice Quality Still Stinks—and How to Fix It|first=Jeff|last=Hecht|work=[[IEEE]]|date=September 30, 2014}}</ref><ref>{{cite web|url=http://www.scientificamerican.com/article/why-is-cell-phone-call-quality-so-terrible|title=Why Is Cell Phone Call Quality So Terrible?|first=Elena|last=Malykhina|work=Scientific American}}</ref> Audio quality can be improved using a [[VoIP]] application over [[Wi-Fi]].<ref>{{cite web|url=http://lifehacker.com/whats-the-best-mobile-voip-app-1579791681|title=What's the Best Mobile VoIP App?|first=Alan|last=Henry|publisher=Gawker Media|work=Lifehacker|date=May 22, 2014 }}</ref> Cellphones have small speakers so that the user can use a [[speakerphone]] feature and talk to a person on the phone without holding it to their ear. The small speakers can also be used to listen to digital audio files of music or speech or watch videos with an audio component, without holding the phone close to the ear. However, integrated speakers may be small and of restricted sound quality to conserve space.

Some mobile phones such as the [[HTC One M8]] and the [[Sony Xperia Z2]] are equipped with [[stereophonic sound|stereophonic]] speakers to create spacial sound when in horizontal orientation.<ref>{{cite web |last1=Hoyle |first1=Andrew |title=HTC One M8 BoomSound speakers are loud and proud |url=https://www.cnet.com/news/htc-one-m8-speaker-comparison/ |website=CNET |language=en |date=2014-03-25}}</ref>

====Audio connector====
The [[Phone connector (audio)#Miniature size|3.5mm headphone receptible]] ([[colloquialism|coll.]] "''headphone jack''") allows the immediate operation of passive [[headphone]]s, as well as connection to other external auxiliary audio appliances. Among devices equipped with the connector, it is more commonly located at the bottom (charging port side) than on the top of the device.

The decline of the connector's availability among newly released mobile phones among all major vendors commenced in 2016 with its lack on the Apple [[iPhone 7]]. An [[adapter]] reserving the charging port can retrofit the plug.

Battery-powered, wireless Bluetooth headphones are an alternative. Those tend to be costlier however due to their need for internal hardware such as a Bluetooth [[transceiver]] and a battery with a charging controller, and a Bluetooth coupling is required ahead of each operation.<ref>{{cite web |title=Was ditching the headphone jack a good idea? |url=https://www.soundguys.com/was-ditching-the-headphone-jack-a-good-idea-13825/ |website=SoundGuys |date=9 August 2019}}</ref>