Iphone 4 to GS4 imessage issue?

I just changed my phone from a iphone 4 to a Galaxy s4. When people who have an Iphone txt me, it keeps sending the message as an imessage, like if their device did not recognized that I didn't had an iphone anymore. It's annoying because they have to manually send the message as txt message so it can be delivered to me. Any clue to how to fix my problem?

They have to remove you as a contact and then add you again. Or if they go into contacts, if your phone number is specifically set as iPhone it will imessage, they can switch it for mobile or home and it should be fine.

Are you sure they aren't sending iMessages to your email (Apple ID) instead of your phone number?

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