I can't run the application on iPhone 6 or 4s either with Xcode 6.2 or 6.3.
更改项目设置的部署目标。
As the other user suggested, select your target from the left sidebar. Then click on General and change the deployment target of your project.
By the way, if you are using Swift please not that Swift doesn't run on iOS versions lower than 7.
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