Wi-Fi on the laptop works, but not on the cell phone?

It is not quite as it is in the question.

When I use my cell phone with Wi-Fi as normal, everything works perfectly, but if I then bring it close to my laptop, I can no longer use the cell phone, at least when I use it. However, if my cell phone is normally next to my laptop, the Wi-Fi will also work.

I ask for the fastest possible answer with a reason and explanation, thank you in advance.

This is definitely due to the Bluetooth, which always transmits with 2.4 GHz, just like the WLAN with 2.4 GHz. If both are active, there are always faults.

My advice, turn off Bluetooth (on the laptop and also on the smartphone) if you use Wi-Fi with 2.4 GHz. However, if you use Wi-Fi at 5 GHz (unfortunately not all devices can) instead of 2.4 GHz, neither of them interfere.

What was it now? Did Bluetooth interfere?

Good if you write it here so that other users can use it as a solution.