The Huawei P20 has many technical highlights on board. However, this does not include the 3.5 mm jack for your headphones.
Because it no longer had any place in the product design of the smartphone. What does that mean?
First of all, you can't use your old 3.5mm headphones as easily anymore. Read correctly: not so easy anymore. Of course, there is still an option to continue using these headphones with the Huawei P20.
USB Type C for headphones on the Huawei P20 - Tip
So you can also use "old" headphones with 3.5mm jack connection with the Huawei P20, You have to use an adapter, which is connected to the USB Type-C connector of the Huawei P20.
Such adapters can already be purchased for little money as for example at Amazon:
- Adapter USB Type C to Audio 3,5mm
The adapter is then simply plugged into the USB Type C connector of the Huawei P20. On the other side comes your 3.5mm headphone jack.