Blocking iPhone

About iMessage and SMS/MMS - What is the difference between iMessage and SMS/MMS? - Apple Support

- iMessage = blue bubble. This is message sent between Apple devices only, over WiFi or cellular-data.

- Text Message = green bubble. Text messages (SMS) or a text+media messages (MMS) are sent over a text-messaging plan. This is a 'regular' text message (note it says "Text Message" at the top) which can communicate between Apple mobile devices and non-Apple phones.

That image shows a message being sent as SMS/MMS text message (green, plus comment), and not as an Apple iMessage / Messages app message (blue).

That can mean either your iMessage is not configured or has no data access is available, or that the recipient’s iMessage is not configured or data access is not available, or the provided contact info used here was SMS/MMS number and with no associated iMessage (Apple ID) address available.

Here is how to set up iMessage (Messages app) on iPhone: Set up Messages on iPhone - Apple Support

As for figuring out if you are blocked, ask the recipient. Once. if they chose to ignore and to not answer, or have chosen to block you, that is their decision. With no answer received in a reasonable time—a couple of days or so—best assume that you are blocked, even if they’re ignoring you and not blocking you.

And if you think you are being blocked, why are you even communicating with this recipient? If they want to talk with you, they will. That is their choice, their decision, and part of their agency. Otherwise, they might consider continued efforts to communicate with them harassment.

And again, if you are explicitly blocked, there will be no indication to you that you are blocked.

I’m not entirely certain what you’re asking about.

Apple iMessage is also known as the Messages app.

Apple Messages app is used for both Apple Messages, and for sending and receiving SMS/MMS messages,

Apple Messages app to Apple Messages (blue) will fall back to using SMS (green), when SMS is the only available path.

Apple Messages to Android or other devices will use SMS/MMS; green messages.

What other people might choose to block or unblock is a separate matter, and that status is not broadcast to others. The messages are discarded at receipt.

If you don’t want to receive messages from them, block them on both on the Apple IDs they are using with Messages, and on whatever other SMS/MMS numbers they might be using. And as mentioned, the blocked people (or bots) won’t be notified of your block.

I thought it was helpful because you were asking if the color of the messages had anything to do with them having received it or not. The color depends upon the type of messaging service used.