When you are looking at your iPhone it will ring on a low sound, but when you are not looking at it it will ring on a high sound until you see it. You can change this in Setteing > Face ID & Passcode > Attention Aware Features.
Volume: Set the volume level for call ringtones, notifications, media, and system sounds. To find this, swipe down from the top of the screen to open the Quick settings panel, and then tap the Settings icon. Tap Sounds and vibration, and then tap Volume. Then, drag the sliders for each sound type.
Ringtone: Customize your call ringtone by choosing from preset sounds or adding your own. To find this, swipe down from the top of the screen to open the Quick settings panel, and then tap the Settings icon. Tap Sounds and vibration, and then tap Ringtone. You can also assign ringtones to specific contacts by opening the Contacts app, then tapping a contact, and then tapping Edit. Tap View more, and then tap Ringtone. Now just tap a ringtone to hear a preview and select it, or tap Add (the plus sign) to use an audio file as a ringtone.
Adapt sound: Customize the sound for each ear and enhance your listening experience. To find this, swipe down from the top of the screen to open the Quick settings panel, and then tap the Settings icon. Tap Sounds and vibration, and then tap Sound quality and effects. Tap Adapt sound and then tap Adapt sound for to select when to change the sound settings, and then tap the sound profile that fits you best. Next, tap the Settings icon to customize it.
Mosquito ringtones emit high-frequency tones that are inaudible by adults but can be heard by teenagers. It is very normal for people to lose their hearing as they age. The loss of hearing is gradual in most people, while other may experience more severe hearing loss.
The high-frequency tones (or mosquito ringtones) are those above 17kHz. Most people over the age of 30 will not be able to hear them. Below are file downloads in MP3, WAV for windows based phones, OGG (Ogg Vorbis audio format), and M4R (iPhone file format).
the best human hearing range is 20Hz to 20kHz so no one should be able to hear above 20kHz
Additionally, this is usually the range of good quality headphones, so what some people are hearing at the higher frequencies is NOT that frequency!!!!!!
A. Silent ringtones might sound like an oxymoron at first. They do have their use, however. There are times, for example, you'd like to mute a specific caller without silencing the whole phone. Just assign a silent ringtone to that contact. Of course, if you have the new iOS 6, it has a Do Not Disturb feature. You can schedule a time period to silence all calls, except those from contacts on a favorites list. Don't forget you can also send calls directly to voicemail by double-clicking the iPhone's power button.
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