Why did you call OPPOr9 and keep saying that the line was busy, and then send me a text message?

The reason and solution of the mobile phone prompt "The subscriber you dialed is busy";

1. When the calling party hears this prompt, it may be that the calling party is really on the phone or the called party is in a network blind area and cannot connect, so please try again at another time.

2. The network and the base station misjudged the status of the mobile phone, so you can restart the mobile phone and try again.