how can I know the iOS app that I made is 32 bit or not? and how can I change that?

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as you know after WWDC all of the apple Developer has lots of problems because we have to submit 64 bit application - I am using swift 3 and Xcode 8.3.2 But my app version is iOS 9.3 and I can test this application on iphone4s so how can I change this app to 64 bit and another question I have iPhone 4s so this application that I am building will not have permission to run in my iPhone ? and should I sell this phone or I can download 32 bit app in this phone after 2018 ?

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Matias Jurfest On BEST ANSWER

To change to 64 bit you should:

  1. Select your project
  2. Select your target
  3. Select Build Settings
  4. Look for Valid Architectures
  5. Set only arm64 as the Valid Architecture