A green text message on your iPhone isn't a sign that your phone number was
The truth is that you can't tell if a person has blocked you based on the fact that your iMessage was sent as a text message alone. Regardless of whether you were blocked or not, you'll still hear the sound of the green bubble text being successfully sent as usual. The message doesn't bounce back.
If it's green, it's an ordinary text message and doesn't offer the read/delivered receipts. iMessage only works when you're sending messages to other iPhone users using the Messages app.
If you see a green message bubble instead of a blue one, then that message was sent using MMS/SMS instead of iMessage. There are several reasons for this: The person that you sent the message to doesn't have an Apple device. iMessage is turned off on your device or on your recipient's device.
If your iPhone messages are green, it means they're being sent as SMS texts rather than iMessages. You'll always see green when texting Android users, or when you're not connected to the internet.
“The last message that you know was received and responded to…should have a 'delivered' status,” Lavelle explains. If, under the messages you've sent after that, you don't see that “delivered” notification, that could mean that person has blocked you.
Delivered means delivered. If your message has been blocked, you will never know unless the recipient tells you you are blocked. The only difference may be if their device was set up to send Read Receipts, if it suddenly just starts saying "Delivered" that means they either blocked you or they shut Read Receipts off.
If you send a message as a regular SMS in the green text bubble and you do not get a “Delivered” notification but instead get a notification similar to “Message not Delivered” or no message at all, that means you were probably blocked.
The most common issue of failed delivery of text messages is blocked Phone Numbers. You can try as many times as you want to send the messages but as long as the recipient has blocked your phone number on their phone, all your effort is in vain.
Send them an iMessage
A red flag that you've been blocked is when you don't see the delivery status or the read receipt at all. The message you just sent will still be in a blue bubble, but it will have no delivery status below it – not even a "Not Delivered."
If you're blocked, you won't see "Delivered" below the most recent text bubble.
If you see your messages green when they should be blue, it can be caused by either the receiver's device is an Android, or there is no Wifi connection available.
Check the Bubble Color
If you don't see a blue bubble on your end, then it's likely that they've blocked you on iMessage. It's important to note that this doesn't mean they have blocked your number altogether; it just means they have blocked you from sending them messages over iMessage.
When it doesn't say Delivered, it means the other person is texting someone else or on the phone. Once they stop texting or hang up the phone, you will see the text message has been delivered.
A delivered text message status does not necessarily mean that the recipient reads the message. It simply means that the message was received by their device and is stored in their memory. The recipient may still choose not to read or open the message, even though it has been delivered successfully.
Call your contact back with a masked number.
If the call goes through like usual--e.g., five or more rings--then your contact has blocked your number. If the call still stops after a ring or less and diverts to voicemail, your contact's phone is dead.
It does NOT mean the recipient has opened it, merely that it was delivered. If you are sending to device on another carrier, you won't see "delivered" since it's another network, and Verizon can't see if it was successfully delivered to the device.
Actually, iMessage not saying “Delivered” simply means the messages have not yet been successfully delivered to the recipient's device due to some reasons. Reasons could be: WiFi not working on iPhone/iPad or the iDevice don't have cellular data networks, they have their iPhone off or on Do Not Disturb mode, etc.
Look for “Delivered” under your last message.
It will appear just below the message bubble. If your message does not say “Delivered”, check the top of your screen to see if it says “Sending…” or “Sending 1 of X”. If you see nothing listed under your last message, your message has not yet been delivered.
The recipient is using a non-Apple device: If you're sending a message to an Android phone, a Windows phone, or any non-Apple device, the message will be sent as an SMS/MMS because iMessage is exclusive to Apple devices. 4.
If you're blocked by someone, your calls will go straight to voicemail, and your voicemail messages will head to the 'blocked' section immediately. The other person won't receive your calls, won't be notified you called, and won't see a badge for your voicemail.