What happens when I erase all content and settings?

I gave my son my iPhone 4.  We just put his sim card in and it started working and  I told him to change the apple id to his.  However, this morning, he said that he still gets my iMessages.  So we did an erase all content and settings.  Now the phone doesn't work.  What do we do?

When you erase all contents and settings - it wipes the phone clean.
If your son gets your imessage, on his phone go to settings - message - send&receive - uncheck or remove your apple id.

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