The key difference between an iMessage and an SMS message is the colour of the text. An iMessage text appears in a blue bubble, and an SMS text message appears in a green bubble.
If a suspicious message appears in green, you may need to
If you get an iMessage from someone who's not saved in your contacts, you'll see a message stating that the sender is not in your contact list, and you'll have the option to
Report junk
.
Select the
Report junk
link to forward the sender's information and the message to Apple.
If you don't have iOS 8.3 or later, you can send an email to imessage.spam@apple.com with this information: