Updated 20 October 2026.
You can use an SD or microSD card with an iPhone through a compatible reader. The card provides external file storage: it does not increase the iPhone’s built-in capacity or become a place to install ordinary iPhone apps.
Choose a reader for the actual port
| iPhone connector | What you need | Important check |
|---|---|---|
| USB-C | A compatible USB-C SD/microSD reader, or a suitable USB adapter. | Reader power, supported cards and data speed. |
| Lightning | A compatible Lightning reader or supported camera/USB adapter. | Some setups need an adapter with an external power input. |
| microSD card in an SD reader | A compatible microSD-to-SD adapter. | The adapter and reader must support the card’s capacity and format. |
Connector shape alone does not promise fast transfers. The iPhone model, reader, cable and card all affect the result. A card’s headline speed is not a guarantee for every file copy, especially with many small files.
Open the card in Files
- Insert the card into its reader, then connect the reader to the iPhone.
- Unlock the iPhone and open Files.
- Open Browse and look under Locations for the card or drive.
- Open a supported file, or copy it to a suitable folder.
- Wait for transfers to finish before disconnecting the reader.
Apple‘s external-storage guide lists supported formats and explains power requirements. It specifies a single data partition and formats including APFS, HFS+, exFAT and FAT variants. Do not format a card containing your only copy of a file; formatting erases its contents.
Import camera pictures into Photos
Files and Photos serve different purposes. Files lets you browse folders; Photos imports supported pictures and videos into your photo library. Follow Apple’s photo import and export instructions for your iOS version. A camera format or folder layout that Photos does not import may still be visible in Files.
Keep the originals on the card until you have opened the imported files and checked that everything arrived. Copying selected photos is useful, but it is not a full backup of your iPhone’s apps, settings and other data.
If the card does not appear
- Reconnect the reader and check that the card is seated correctly.
- Test the card on another device without accepting an erase prompt.
- Check the filesystem and partition layout.
- Check whether the reader or connected storage needs more power.
- Try a known compatible reader before blaming the card.
For scores and other PDF documents, our sheet music app guide explains what to check after importing. An app may need its own copy of a file rather than reading it directly from the card.
FAQs
Does an SD card expand iPhone internal storage?
No. It remains an external device accessed through supported apps.
Can I use microSD in a normal SD reader?
Usually with a compatible microSD-to-SD adapter, provided the reader supports the card type and capacity.
Why does Files see a video that Photos will not import?
The apps support different workflows and formats. Check the video format and Apple’s import guidance.
Should I delete originals immediately after copying?
Wait until you have checked the copies and have another backup of anything important.