“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.
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.
Android users may determine if someone has blocked their number by checking notifications. If the “sent” icon changes to “delivered,” the receiver is likely not blocked you. On the other hand, if it stays on “sent,” there's a good chance they have blocked your number.
Messages that are sent or received won't be delivered. Also, the contact won't get a notification that the call or message was blocked.
Android phones move all blocked messages into a folder on the phone called “Spam and Blocked.” That means that the phone is still collecting messages from the blocked people; they just aren't notifying you. This can be a lifesaver in needing those blocked messages for various reasons after the fact.
Use another phone number
You can try texting them by your secondary phone numbers, office phone numbers, or the phone numbers of some friends or relatives. It is highly likely that you will receive a response from the person who blocked your number.
If you see green bubbles, this means that your text messages are being sent through SMS, and they might have blocked you on iMessage. For example, if you send me a message and I receive it with a green bubble, this means that the message was sent through SMS rather than iMessage.
So if you send a message to someone who has blocked you, then everything will look normal with you. You will also see Delivered Status if you send messages via iMessages - but the message does not reach the recipient. The recipient will also not be able to see that you have tried to send a message to them.
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.
Call or FaceTime the person who blocked you
If someone blocks you, you can't send an iMessage, call, or FaceTime them. The next step to test if your number is blocked is to place a call. Interestingly, when you call the blocker, the phone rings just once and then diverts to voicemail or gets cut off.
Their status appears as “unavailable” You cannot send them any messages, and if you try, you will get a message saying that the user is unavailable. If you try to call them you will hear that the number is busy or unavailable. If you search for them and get no results.
For Android, go to Settings > Call Settings > Additional Settings > Caller ID. Then, select Hide Number. Your calls will remain anonymous and you can bypass the blocked list.
If the other person switched to an Android phone, their bubble may have turned green (plus, they may have a new number). That means you may have to find it more directly if the other person switched from iOS to Android. If you were blocked, those green text bubbles mean the message was not received.
Blocking is a function that allows users to prevent someone from contacting them via phone, text message, or iMessage. If you have been blocked, you will not be able to send iMessages to that person. Instead, your messages will be sent as text messages, and in some cases, they may not even be delivered.
Blocking Someone on Android Messages and Apple iMessage
When you block a contact over Android or iPhone, they will still be able to send you text messages. These messages will not show up on your phone but the sender will see the messages as sent. They won't know that they've been blocked.
The recipient opted out of messages or blocked your number
Similarly, if a recipient blocks your phone number, your message won't be delivered. This is the likely explanation if you don't see a “Delivered” or “Read” message notification.
If the iMessage never shows a “Delivered” or “Read” message, and it's still blue, then you may have been blocked – but not always.
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.
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.
A green bubble simply means you are sending her a message through cellular SMS communications. It does not mean you're blocked. It's on for iMessage.