What if my phone is attached to a different apple id

What are you asking? Do you use a different ID now? You need to go into the iTunes Store, log out of the old ID and sign in with the new one. If you are referring to something else, such as Activation Lock, you need to explain better.

I have 2 iPhones and 2 iPads connected to one iTunes account. Do you know if it's possible to migrate 1 iPhone and 1 iPad to a different iTunes account without loosing data/photos/apps/music?