If my iphone gets shut off like the service would I still be able to use it?

My uncle is turning off my iphone and I'm kinda scared cause I mean I like my iphone is my life and I use it All the time. Would it just be like an ipod touch? I do have Wi-Fi.could I still use the imessage and call ppl n text and stuff even if its off and all I have is Wi-Fi? What apps could I use or can't use? I mainly use kik, facebook, tagged, and mocospace.pandora, iheartradio, instagram. And facebook messenger, pink pad (period calendar) and my fitness pal. Lol i'm like really scared that I may not use my phone anymore once it's off. This is gonna be the FIRST time my iphone will be off and i don't know what to expect. Please no mean answers. :/

You can't do any of those things without Wi-Fi