Will I still be able to use apps on my iPhone or use it like an iPod if I unregister it?

Will I still be able to use apps on my iPhone or use it like an iPod if I unregister it?

Did you sign out of iMessage on the iPhone 4?
Settings > Messages > iMessage > OFF 
If you did, try the steps in this support article
Howto: Deactivating iMessage on lost or sold iPhones

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