If your air conditioner is a smart air conditioner, use your smart phone to download an app of this brand of air conditioner, and after binding, you can operate it on the app of your smart phone;

If your air conditioner is not a smart air conditioner, Haier has produced something called "air box", which is equivalent to "infrared remote controller+detection device". You use your smartphone to download an apps control box of this box, which sends infrared signals to the air conditioner. Haier casarte's brand can definitely be used, and other brands can also be used if they are open and compatible;

If the above two can't work, then you have to have a mobile phone with infrared code, and control the air conditioner with red code according to the coding rules of your air conditioner control code.