When sending a message to someone on WhatsApp, you will have noticed that the sending of the message is quickly followed by one grey tick (also known as a checkmark). Then a second grey tick. Finally, those two grey ticks turn blue. What do they mean? Those WhatsApp checkmarks actually tell us a lot.
There are three stages to a WhatsApp message, and these stages are categorized by a series of ticks (or checkmarks). At each stage, you can clearly see the status of your message. If the recipient of your messages is reading and responding to your messages right away, then these checkmarks will change extremely fast. But if the recipient is slow to respond, this is how to tell where things are at.
One grey checkmark
One grey checkmark means that WhatsApp has successfully sent the message on its way. But it hasn’t reached the recipient’s phone yet. How fast this changes to two checkmarks depends on factors such as the reliability of the other person’s internet, whether or not they’ve got their phone switched on, or whether or not they’ve blocked you.
Two grey checkmarks
Two grey checkmarks mean that the message has successfully arrived on the other phone’s screen. However, the person has not yet read the message.
Two blue checkmarks
Two blue checkmarks mean that the message has been read. However, if this is a group chat, the two grey ticks will not turn blue until everyone in the group has read the message.
Is it possible to read a WhatsApp message without turning the two checkmarks blue?
Yes. If you want to read a WhatsApp message, without the sender knowing you’ve read it, switch on Airplane Mode on your phone first. This will disable your mobile internet data plan and Wi-Fi. You can then read the message without activating the read receipt function in WhatsApp and triggering the two blue checkmarks. Obviously, when you switch off Airplane Mode, the read notification will then be sent.
What does it mean if my WhatsApp message is constantly stuck on one grey checkmark?
It could simply mean that the recipient’s phone is switched off. Or that the recipient is experiencing internet problems, preventing them from accessing WhatsApp. Or thirdly, it could mean you’ve been blocked by that person. If the one grey checkmark doesn’t turn to two checkmarks within 24 hours, then it’s safe to say you’ve been blocked.–androidauthority.com