Q: Update ios Appstore app to allow only iPhone I have my application in apple app store supporting, iPhone,iPad and iPod (Universal), Now I want to have my app compatible with only iPhone, How to achieve that.(In xcode device family I can check only iPhone and sumbit app sotre, will this make my app only supporting iphone ) Please help

A: It is not possible with the original Bundle ID.
Citing from the doc below:
https://developer.apple.com/library/content/qa/qa1623/_index.html

Bundles must continue to support any devices previously supported.

The only option for you is to create a new bundle ID and submit your app with it.

Removing your app from the store, and uploading the update with a
  different bundle ID, will allow you to narrow the range of devices
  your update supports. However the update will be listed on the store
  as a separate app.

