It's hard to decrease the noise in powerline since we cannot really see it. You may try the FAQ from TP-Link: http://www.tp-link.com/en/faq-409.html About the speed showing on the utility, it should...

That's won't work. The USB port on VR400 is for USB modems. It won't work with the phone.

You can just send an email to support.uk@tp-link.com. It will go to their email support.

For the speed, if you have different speed in different locations, probably some locations are further away from the main powerline adapter, and have more interference, while some locations which...

The language on the product from mainland China can only be Chinese. We cannot change it. You may try to send email to the Tech Support department for Mainland China products to see whether they can...

You may check the lights on the TL-WPA4220. If the Wi-Fi light/ the light at the bottom is off, probably you have disabled the Wi-Fi function by yourself. You can press that Wi-Fi light (which is...