Hi @Jax . What model router do you have?
When you try to connect, how far from the router are you? How does it go up close?
What signal strength does the phone show? I see on the picture it shows 2 out of 3 bars. How does that compare with the iPhone XR?
Do you use the 2.4G or 5G band? 2.4G band has greater range; 5G is faster.
@Jax . Position close to the router. Do this on each band. Make the connection and check the wifi connection speed (however you do that on iPhone). Compare with the XR.
When you do this with your phone, turn off wifi on the XR so there's no chance of interference.