Does Imessage still work with just Wi-Fi?

Am I still able to send messages to iphone user, when I'm connected to Wi-Fi? I bought a iphone from a friend & I was trying to see if it was stolen I heard if the phone was black listed it won't be able to send messages through Wi-Fi or any at all that true?

If Apple or your carrier on its behalf, has locked your phone, you may not be able to connect with it. Jailbreak phone are also considered to be illegal as in Apple Rules and Regulations because thats how your phone becomes illegal.

If you are not able to connect to iTune or iMessage, there can be same reason i.e. Jailbreak, doesn't necessarily mean that it is a stolen one.: )

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