Iphone and samsung galaxy s4

Hi so I got a samsung galaxy s4 yesterday because my iPhone was slow but now whenever someone with imessage messages me it goes to my iphone even though it has no simcard in it. How do I change this because I can't receive messages on my Samsung galaxy S4 from people with an iPhone? ♡

IMessage is an iPhone app. You need to download the app to your Android.

I think the people with iPhones are sending text messages to your email address, that you used to create your Apple account. Ask them to sent text you with your cell phone number not your email. If this doesn't work, you and the people you text should try an app like Whatsapp or Viber.