The iPhone is considered a device with almost the highest quality speaker among all gadgets. But sometimes there is such a problem that the phone receives a call, but there is no sound signal. It may also not play multimedia, although everything suggests otherwise.
The first thing to do is to check the position of the switch on the left side of the phone. If it is omitted, then the ringing sound and some functions will not be heard. Switching to another position should correct the situation.
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The second is to see if the sound is turned off in Settings. To do this, open the appropriate application, find the 'Sounds' item and check how much the volume is turned up in the 'Calls and Alerts' tab. For the ringtone to sound, the slider should not be located to the left.
Everything is much easier if music or video is inaudible. Here, simply adjust the volume using the buttons on the phone or through the control center.
If none of the above helped, then it is worth replacing the speaker, because the problem is most likely hidden in it.