I would like you to tell me the necessary steps to operate a water pump for the well, remotely from the mobile.
I plan to use a nano arduino card, a wireless router connected to the internet, a mobile application written in Flutter

 

Your plan sounds quite complicated and I'd argue that simplicity and reliability are priorities which go hand in hand. It's a good idea to use a submersible pump because it's pushing rather than pulling, essential if the depth is greater than 9.8 meters (32 feet).

If it pumps into a tank suffiently high to provide the head of water you need, with a tilt switch on a ball cock it'll turn the pump on and off when the level drops and rises respectively. A slightly more complicated double tilt switch arrangement can turn the pump on when the level is low and off when it's high.

I'm wondering the circumstances whereby you need to need to turn the pump on and off remotely? If it's related to the status of sensors, this could be automated in situ.

 

I would like you to tell me the necessary steps to operate a water pump for the well, remotely from the mobile.
I plan to use a nano arduino card, a wireless router connected to the internet, a mobile application written in Flutter

I have a water pump for my home and four other homes here. Why you'd want to control that from a phone makes no sense to me.

We have a monitoring device on the well and that reports the volume of water (emails and text alerts) in the tank every 12 hours or if it hits a low threshold, if it does hit the low threshold then it automatically triggers a water delivery for us.

Our well is deep too, over 900ft and the pumps are pretty serious machines.

But I see no reason for trying to control the system from a phone.

 

There are many WiFi relay boards. I use SonOff. They have 10 and 15A relays. Most of the boards have on, off, timer, functions. They need a WiFi connection and can be controlled by phone or computer.

 

Ok. Thank you.