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Can iPhone and iPod use same Apple ID?
They must be same in iPhone and iPad in order to share app purchases. The best way is to use one Apple ID among all of your Apple ID devices. In rear cases you will need separate Apple ID accounts when you need to separate contacts or other private info.
Can I use the same Apple ID on all my devices?
We recommend that you use the same Apple ID for all Apple services on your device—including the iTunes & App Stores and iCloud. Using multiple Apple IDs might be confusing and cause issues with accessing purchased content or using some services. If you have multiple Apple IDs, you can’t merge them.
Can you have the same Apple ID on both your iPhone and iPad?
Then just log in with your Apple ID. They must be same in iPhone and iPad in order to share app purchases. The best way is to use one Apple ID among all of your Apple ID devices. In rear cases you will need separate Apple ID accounts when you need to separate contacts or other private info.
How can I use multiple Apple IDs for iCloud?
On your Mac, go to System Preferences > iCloud and sign in with the Apple ID that you want to use with iCloud. Go to iTunes > Account > Sign In. Enter the Apple ID that you want to use with iTunes. If you use multiple Apple IDs and want to restore your device from a backup, you can learn more about iCloud or iTunes backups.
Why do I need a separate Apple ID?
One possible use for separate Apple IDs is to have a separate ID associated with a particular device. This could be important with iMessage or Facetime, because if you associate all your devices with one ID, you will receive iMessages or Facetime calls on all your devices simultaneously.
Note that once done you cannot “share” apps under a single Apple ID. Each of you must purchase your own apps under your own Apple ID. When you decide to split up like this one of you will need to re-purchase the apps that they want to use. Start by transferring the new device(s) to a new account along with all your data.