How to receive iMessages still on an old iPhone not in use?

I was wondering if it would be possible to still somehow activate an old iPhone to receive texts. The story is, my boyfriend upgraded to an iPhone 5, he left his iPhone 4s at my house about a month a go now. & he's been acting shady. Is there a way I could still receive texts sent to him on this old phone? He has the same number. Or is there a way to receive his texts knowing his Apple ID? Any help would be great!

If you know his Apple ID password and email you can log in and receive all iMessage sent texts from the moment you log in, but if he sends text messages you can't see them unless you have his actual phone. Hope this helps

Apple ID needed to turn on iMessage in settings. Granted phone would have to be connected to Wi-Fi since no cell signal for it now. But will only get iMessages and not regular texts from non iPhones.
But if you know Apple ID of his then you can track whereabouts if 'find' is activated on current handset.
https://www.icloud.com/...cloud.com/ Then use 'find my iphone'
Best luck.

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