Is there a charge for cool D520 weather forecast? How to change the city?

It's free. It's connected to the Internet, so as long as I can visit the webpage, I can update the weather forecast. My mobile phone is D520.

To change cities, click the main page of weather forecast, and then there is a white box under the font of weather forecast in the upper left corner to choose from. Click that there is a city in it, and just click update.

Please accept it if you are satisfied, thank you! ! !