iCloud is a service that allows you to store your backups and data in the cloud. This means that when you delete an iPhone from iCloud, all of the information on it will be erased and cannot be restored. If you want to keep the data on your phone, you should not delete it from iCloud.
If you remove your old iPhone from iCloud, it will no longer be able to communicate with other devices. This means that any data stored on the device will not sync to other devices. This includes photos, contacts, calendar events, and more. The only way to get this data back is by restoring the iPhone from an iCloud or iTunes backup.
The short answer is that you should not erase your old iPhone if you want to keep it as a backup phone. The reason for this is that the two phones will share some data and apps, and deleting one of them may cause you to lose some of your data.If you want to use one of your old iPhones as a backup phone, you should set up the new phone first and then restore it from backup on the old phone.
When you remove a device from your Apple ID account, that device will no longer be able to access content or services that are associated with that account. You will need to re-download any app, music, movies, TV shows, books, etc. from the App Store or iTunes on the removed device in order to continue using them.
No, you should not keep your old iPhone as a backup. There are many reasons for this, but the most important one is that the old phone will be out of date and will not have the same functionality as your new phone.
