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Home/ Questions/Q 7161033
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Editorial Team
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Editorial Team
Asked: May 28, 20262026-05-28T13:29:50+00:00 2026-05-28T13:29:50+00:00

Following this question, how do I launch instruments with iPhone simulator as a device.

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Following this question, how do I launch instruments with iPhone simulator as a device.
I tried this:

$ instruments -t /Developer/Platforms/iPhoneOS.platform/Developer/Library/Instruments/PlugIns/AutomationInstrument.bundle/Contents/Resources/Automation.tracetemplate -w iphonesimulator5.0 MyApp.app

But I get this error:

Instruments Usage Error : Device failed to become ready for use.

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  1. Editorial Team
    Editorial Team
    2026-05-28T13:29:51+00:00Added an answer on May 28, 2026 at 1:29 pm

    -w <deviceID> is used only when you wish to specify a hardware device as the destination (the ‘deviceID’ here is the Identifier of the device, found in the Organizer of Xcode).

    Instead of using -w, you can specify a flag during the build to force instruments to use iPhone. Details can be found here.

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