I called someone, and the line you dialed was busy. But the message I sent him was sent normally. What happened?

Dial the phone and beep, and then prompt that the line is busy. There may be two situations:

1, the other party will put you on the blacklist of his mobile phone, and the mobile phone will automatically prompt for a busy tone.

2. The other party's mobile phone is set to Do Not Disturb mode. When you dial, his cell phone is in Do Not Disturb mode, which makes it impossible to dial.

You can try calling someone else's cell phone. If you can get through, he will blacklist you. If the dialing result is the same as your mobile phone, it should be that he has set the Do Not Disturb mode. No one can pass under do not disturb mode.

Do not disturb the setting of mode.

Set time: This means that you can set a time period. If Do Not Disturb mode is enabled, incoming calls will be muted during this time period, but incoming calls outside this time period will not be muted.

"Allow these people to call" in Do-Not-Disturb mode: It is aimed at people or groups who will not mute incoming calls to avoid those unfamiliar calls. Anyone, everyone and individuals can choose it. There are also groups added by all contacts, family members, etc.