Mobile phone set empty number

We need (step 3) to set the cell phone number. The model of this demonstration is Glory 50; System: MagicUI4.2；; The following are the detailed steps:

1 call forwarding

Open settings and search for call forwarding;

1. Call Forwarding 2 Click Call Forwarding.

Click the call forwarding option;

2. Click Call Forwarding 3 Unconditional Call Forwarding

Just set up unconditional call forwarding.

3. Unconditional call forwarding