Imessage not working on my iphone 5 what to do?

Okay so i took my aunts iphone 5 from her since she got a new one. I have had it for a month now. Today i was at my cousins place and she was like ohh lets activate the imessage (she has an iphone too) we went into the options and stuff we added my iphone account but when it came to verifying my phone number it wouldnt let us… The numbers of my aunts number is stuck and it has a light grey colour… I've restarted the phone and turn on and off the imessage several times now but nothing another thing under turning imessage on or off it still says waiting for activation… What to do?

There are possible methods to fix iMessage "Waiting for Activation" error in the below resource

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