Apple iPhone 5s 2 Apple IDs When you set up your Apple ID when you first get your phone can you set up another once you have signed in on that account?
Short answer, yes, long answer, it's going to be a lot more trouble than it's worth. You'll have to constantly swap between them to get downloads/updates etc.

Each app/book/tune etc, even the iOS itself belongs to the account that purchased it.

If you really must have 2 IDs on one phone, the best solution is probably to set up Family Sharing &amp; join both IDs to the same 'family'.