I sent a message to 100 1 and sent a photo. Why?

It doesn't matter. 100 1 is the customer service hotline. Generally, you can only send text messages, but you can't receive them.

100 10 is the customer service hotline of China Unicom, which provides self-help and manual services.

When you receive a short message from 100 10, it is usually a service reminder. If you have Unicom business consultation or encounter problems, you can call customer service for consultation.