> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mobster.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Developer Mode disabled

> Developer Mode is off on your iPhone, so Xcode and Mobster can't run their helper on it. Turn it on in Settings and restart the phone.

You see this: Xcode prints `Developer Mode disabled To use … for development, enable Developer Mode in Settings → Privacy & Security.` as the reason for an ineligible destination. Mobster says it as `Developer Mode is off on` your iPhone, and `mobster doctor` prints the Developer Mode line with a `✗`.

## Why it happens

iOS refuses to run development builds, including Mobster's helper, until Developer Mode is on. Mobster never turns it on for you: it's a switch on the phone.

## Fix

1. On the iPhone, open **Settings › Privacy & Security › Developer Mode**.
2. Turn **Developer Mode** on. The phone restarts.
3. After the restart, unlock the phone and confirm **Turn On** when it asks.
4. Plug the phone in, keep it unlocked and choose **Check again** in Mobster for Mac, or run `mobster doctor`.

## Check it worked

`mobster doctor` prints `✓ Developer Mode  on` once it's on.

Checked 26 Oct 2026 against Mobster 0.4.0. Back to [Troubleshooting](https://docs.mobster.dev/troubleshooting.md#iphone).


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