Navigate to [https://ads.google.com/aw/overview](https://ads.google.com/aw/overview?ocid=875541981&workspaceId=0&euid=1187639413&__u=1432826637&uscid=875541981&__c=9961346869&authuser=2)
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Click "Overview"
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Select the campaign **you want to modify.**
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Click on **the campaign.**
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Scroll down to **devices and click here.**
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Sort by **"Cost / conv."**
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Click "Edit this Bid adj."
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Select "Decrease".
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Click this text field.
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Type "100"
By editing the bid adjustment to 0%, **no ad spend will target users on these devices.**
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Save your **changes!**
Selecting "increase" and entering 100% on a device **does not do the same thing as "decreasing" 100%.**