What Does *3370 Do on an iPhone? Explanation and Impact

Discover how dialing *3370 on your iPhone enhances call quality and what to expect.

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Dialing *3370 on an iPhone activates Enhanced Full Rate (EFR) coding, which can improve voice call quality by using more bandwidth. Be mindful that this might reduce your battery life faster due to increased data processing. To deactivate, dial #3370#. This feature primarily affects older 2G networks and may not be supported by all carriers.

FAQs & Answers

  1. What is Enhanced Full Rate (EFR) coding? EF R coding improves voice call quality by using more bandwidth, enhancing clarity during calls.
  2. Will using *3370 drain my battery? Yes, activating *3370 may reduce battery life due to increased data processing for better voice quality.
  3. How can I deactivate *3370? To deactivate *3370, simply dial #3370# on your iPhone.
  4. Does *3370 work on all networks? No, *3370 primarily affects older 2G networks and may not be supported by all carriers.

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