Why can't I hear Instagram videos?

[Mishka]

Tell me step by step

[Amazinggrass717]

Some videos don't have sound because the ignorant people who recorded them didn't enable their microphone

[dan]

if you have an iphone:
step 1: turn tot the side of your phone where the volume buttons and the silent mode button is
step 2: turn silent mode off by pushing the silent mode button to the top (so it covers the red line)
step 3: watch instagram video with sound