You will need
  • mobile phone;
  • -the Internet.
Instruction
1
If you send a message from your phone, then on delivery you can know for sure. To do this, you must configure the delivery report. The report comes in the form of a message that tells you, you got your message or it is in standby mode. This means that the recipient's phone is switched off or out of range. The message is stored by the operator within three days, if the phone were not included - it will be gone. So, a custom report: go to "Messages" select "message Settings". In some models of SMS are a separate item - it need. In this menu, go to "sending options" (it may be called differently, for example, "send Profile"), it is the default settings choose the "submission Report". If we are talking about the messenger, some of them, like Skype, gives out the message that delivery was not implemented. This occurs if the recipient is not in network. ICQ often does not display any messages. In this case, you need to understand that sending can be done through the server, and, most likely, as soon as the user goes in messenzhder, the message will be received. But as the messenger work through the less reliable channel of delivery than, for example, mail, that message can easily get lost. So just ask the recipient.
2
If we are talking about the messenger, some of them, like Skype, gives out the message that delivery was not implemented. This occurs if the recipient is not in network. ICQ often does not display any messages. In this case, you need to understand that sending can be done through the server, and, most likely, as soon as the user goes in messenzhder, the message will be received. But as the messenger work through the less reliable channel of delivery than, for example, mail, that message can easily get lost. So just ask the recipient.
3
When sending e-mail all depends on the client. Most often, the delivery notification works as follows: the delivery is the default, if not found its destination, the sender receives a notification. But in addition, you can configure the read receipt. The configuration process depends on the mail server you use. For example, in mail.<url> tick "read receipts".