He has texted me that the activation was successful, but there is still no signal.

1. First, check whether the mobile phone card has been activated. If not, it is recommended to activate the mobile phone card first.

2. There is no signal in the mobile phone, and it is not excluded that the signal will be affected by various factors such as topography, landforms and tall buildings. If the mobile phone is placed in a relatively closed place, the signal will be affected. The treatment method is as follows:

1) Shut down again and try again;

2) Replace the mobile phone card with the mobile phone of family or friends and try again;

3) See if there are any signals from other Unicom users around;

If there is no signal, you can contact Unicom customer service for feedback.