Monitor Windows Phone
Configure Fiddler
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Start Fiddler Classic on the Fiddler server (the machine that will capture the traffic).
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Click Tools > Options. Click Allow remote clients to connect.

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Restart Fiddler.
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In the Windows Security Alert dialog, check all three checkboxes and click the Allow Access button.

To verify this configuration, enable your Windows Phone WiFi connection and visit http://FIDDLERSERVER:8888, where FIDDLERSERVER is the machine name for the machine running Fiddler. This should display the Fiddler Echo Service web site.
Configure Windows Phone
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Tap Settings > WiFi.

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Tap the active WiFi connection.

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Slide the Proxy Slider to On.
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In the Server/URL field, type the machine name for the Fiddler server.
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In the Port field, type 8888.

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Tap the checkmark icon.
Decrypt HTTPS Traffic
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On the Windows Phone, use Mobile IE to request an HTTPS protocol URL.
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Go to
http://FIDDLERSERVER:8888/FiddlerRoot.cer. -
Tap the icon labeled Tap to open the file fiddlerroot.cer.

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Tap install.

Note: There is no known resource containing steps to remove security certificates from a Windows Phone. This may prevent connecting to a different Fiddler proxy, which will use a different security certificate.
Disable Monitoring
After Fiddler Classic monitoring is complete:
- Tap Settings > WiFi.
- Tap the active WiFi connection.
- Slide the Proxy Slider to Off.