When a chat is received by the other user you will get a delivery confirmation which is represented by a double blue tick on the message bubble. One blue tick indicates only that the chat has been received by the callto.net cloud platform.
When a user open chat containing the received message, the sender will get read confirmation and the double ticks will change color to dark blue.
Chat’s delivery statuses:
Sent – one blue tick, message reached the platform
Delivered – two gray ticks, message reached the destination device
Read – two ticks change color to blue, the receiver opened chat window with the message