How do I fix my mic on my IPhone?

Recently, I was listening to music with my earbuds in until a sound started ringing through the earbuds and I immediately disconnected and restarted my phone. After that, whenever I call or FaceTime someone, the other person can't hear me but I can hear them. What should I do?

Step 1) bring it to a repair store to fix it, just not apple store because they are expensive

step 2) buy an android next time

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