Using iPhone without cellular service
How do I use my iPhone 5 just like an iPod without cellular service? When I tried to setup the iPhone 5 with my daughter's Apple ID, it kept wanting to communicate or message via my old phone number. If I go forward with this setting, I'm afraid it may move my phone number from my new iPhone 6 Plus this old iPhone 5. I do not want that. I just plainly want to use it as an iPod with WiFi capability.
iPhone 5, iOS 8.1