Example code of MIT app, about sending data from Raspberry Pi pico to the phone

For example like this

from machine import Pin,UART
import time
uart=UART(0,9600)

r=Pin(10,Pin.OUT)
but=Pin(15,Pin.IN)

while True:
if uart.any():
data=uart.read()
data=str(data)
print(data)

    if('R_ON' in data):
        r.value(1)
        
    elif('R_OFF' in data):
        r.value(0)
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What is your problem actually ?

This with Raspberry Pi 3 Model B:

https://community-appinventor-mit-edu.ezproxy.canberra.edu.au/search?q=raspberry

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just dont know how to use phone to read the data from the raspberry pi

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