If you hear noise while on call or using cellular data on your iPhone 4S

When using iPhone 4S, you might hear an echo, static, or crackling noise while you're on a call or using cellular data.

If this happens only when you're using the receiver, try these steps:

  1. If you have a case on your iPhone, make sure that the top microphone next to the headset jack isn't covered, or remove the case completely.
  2. If you have a protective film on your screen, make sure that the receiver isn't covered, or remove the film completely.
  3. Check the receiver mesh. If it looks blocked, use a clean, small, dry, soft-bristled brush to gently brush away any debris.
  4. If you hear the noise only in one location, try another location.
  5. Try restarting your iPhone.
  6. If restarting doesn't fix the issue, update to the latest version of iOS.
  7. If you still hear the noise, set up repair service for your iPhone.
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