So whenever I call someone, they can’t hear me and I can’t hear that

Hello aime100,

We'll need to take some steps to determine whether this is an audio or network issue with your iPhone.

The steps in If you hear no sound or distorted sound from your iPhone, iPad, or iPod touch speaker - Apple Support can help us determine whether there's an issue with your iPhone speaker.

1. "Remove all screen protectors, films, or cases from your device. 
2. Check the speaker opening to see if it's blocked or dirty. On iPhone only, make sure that the receiver isn't blocked or dirty. 
3. If necessary, clean the speaker or receiver opening with a small, soft-bristled brush. Make sure that the brush is clean and dry.
4. Go to Settings > Sounds (or Settings > Sounds & Haptics), and drag the Ringer and Alerts slider back and forth a few times. If you don't hear any sound, or if your speaker button on the Ringer and Alerts slider is dimmed, your speaker might need service.
5. If you hear sound, try making a call with your iPhone and turn on speakerphone. On iPad or iPod touch, make a FaceTime call. If you still can't hear, or hear static or crackling, then your network or reception could be the issue. Try to call again later, or from a different location."

As mentioned above, if you're not hearing any audio when completing step 4, there may be a hardware issue with your device, and you'll want to contact Apple Support to explore service options for the device.

We look forward to hearing the results.

Regards.