At present, there are two known 4nm chips, one is Qualcomm's upcoming Snapdragon 898, which is built by Samsung's 4nm process and has a dual-part 3400 new architecture equipped with Adreno 730 GPU; The chip will have a large Cortex-X2 core and will eventually be capable of up to 3.09GHz.
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The other is the Teguet 2000 from Mediatek, which will use TSMC's latest 4nm process technology, and is also expected to use new architectures such as Cortex X2, A79 and G79.
There are currently no 4 nm phones, the most advanced ones are 5 nm