Configure Fiddler
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Click Tools > Fiddler Options > Connections.
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Click the checkbox by Allow remote computers to connect.
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Restart Fiddler.
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Ensure your firewall allows incoming connections to the Fiddler process.
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Hover over the Online indicator at the far right of the Fiddler toolbar to display the IP addresses assigned to Fiddler's machine.
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Verify client iOS device can reach Fiddler by navigating in the browser to http://FiddlerMachineIP:8888. This address should return the Fiddler Echo Service page.
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For iPhone: Disable the 3g/4g connection.
Set the iOS Device Proxy
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Tap Settings > General > Network > Wi-Fi.
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Tap the settings for the Wi-Fi network.
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Tap the Manual option in the HTTP Proxy section.
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In the Server box, type the IP address or hostname of your Fiddler instance.
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In the Port box, type the port Fiddler is listening on (usually 8888).
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Ensure the Authentication slider is set to Off.
Decrypt HTTPS Traffic from iOS Devices
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Download the Certificate Maker plugin for Fiddler.
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Install the Certificate Maker plugin.
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Restart Fiddler.
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Configure the device where Fiddler is installed to trust Fiddler root certificate.
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On the iOS device, go to http://ipv4.fiddler:8888/ in a browser.
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From the bottom of the Fiddler Echo Service webpage, download the FiddlerRoot certificate.
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Open the FiddlerRoot.cer file.
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Tap the Install button.
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Tap the Install button again.
Uninstall FiddlerRoot Certificate
If you decide to uninstall the root certificate:
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Tap the Settings app.
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Tap General.
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Scroll to Profiles.
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Tap the DO_NOT_TRUST_FiddlerRoot* profile.
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Tap Remove.