Emily ParkerBy Emily Parker

Updated November 2026

What bluetooth codec does iPhone use? Apple’s iPhones use AAC (Advanced Audio Coding) for most Bluetooth audio, and they fall back to SBC when the connected device doesn’t support AAC. This guide explains how the iPhone chooses a codec, how to tell which one is active, and what you can and can’t change on your end.

How the iPhone Picks a Codec

Bluetooth codecs are negotiated between your iPhone and the headphones or speaker when they connect. Both devices advertise the codecs they support, and the best one they share is used. Because the iPhone always supports SBC, that is the floor. If your headphones support AAC, the iPhone will select AAC. If they also support aptX or LDAC, the iPhone still won’t use those, because iOS doesn’t include support for them.

Shopping for one? See our guide: Jabra Elite 65t Bluetooth Codec Review: What You Should Know.

This matters because the codec affects bitrate and, indirectly, audio quality and latency. SBC typically runs at a lower maximum bitrate than AAC, so headphones that only support SBC will sound the same as they would on any other SBC device.

Checking Which Codec Is Active

iOS does not show the active codec in a menu. You can’t open a status screen and read it off. In practice, you confirm the codec by checking your headphones’ supported list and by looking at the connection behavior.

  1. Check the specifications your headphones’ manufacturer publishes. Look for “AAC” in the codec list.
  2. Make sure the iPhone is on a current iOS version, since codec handling is updated through iOS releases.
  3. Pair the headphones, play a high-bitrate track from a streaming service that supports lossless or high quality, and compare with a standard setting.
  4. If the headphones only list SBC, expect SBC on the iPhone regardless of your settings.

What You Can and Can’t Control

On an iPhone, you cannot manually choose the Bluetooth codec. There is no toggle in Settings. The codec is chosen automatically during pairing and reconnection. That is different from Android, where Developer Options exposes a codec selector on many phones.

What you can influence is the connection itself. Keep the headphones within range, avoid heavy interference from other 2.4 GHz devices, and make sure the firmware on the headphones is current. Firmware updates sometimes improve codec support or stability.

Why AAC Sounds Better Than SBC

AAC generally delivers better audio at a given bitrate than SBC, so it preserves more detail in the highs and mids. Many listeners find the difference most noticeable on complex music such as orchestral recordings. The gain is real but modest, and it depends on the headphones, the source file, and your hearing.

Common Mistakes

  • Assuming aptX or LDAC will work with an iPhone. iOS does not support them, even if the headphones do.
  • Expecting a Settings toggle for codecs. There isn’t one on iPhone.
  • Blaming the codec for dropouts. Interference and distance are more common causes.
  • Skipping firmware updates on headphones that list AAC support.
  • Over-ear headphones with AAC support: Look for models that list AAC in their specifications so the iPhone can use it. View on Amazon
  • Bluetooth receiver with AAC: Useful if you want to connect older wired headphones to an iPhone while still getting AAC. View on Amazon

FAQ

Does the iPhone support aptX?

No. iPhones do not support aptX or aptX HD. Headphones that support only aptX will fall back to AAC or SBC when paired with an iPhone.

Can I change the codec on my iPhone?

No. The codec is negotiated automatically between the phone and the headphones, and iOS does not offer a manual selector.

Is AAC lossless?

No. AAC is a lossy codec, but it is generally more efficient than SBC, so it usually sounds better at similar bitrates.

Conclusion

Your iPhone uses AAC for Bluetooth audio whenever your headphones support it, and falls back to SBC otherwise. You can’t pick the codec manually, so the practical steps are checking your headphones’ supported codec list and keeping their firmware current. If you’re buying new headphones, AAC support is a reasonable thing to confirm on the specification sheet.

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Emily Parker

About Emily Parker

Emily Parker is part of our editorial team and reviews and edits our headphone tech & types guides, checking product details against manufacturer specifications and owner feedback.