from com.android.monkeyrunner import MonkeyRunner, MonkeyDevice

import time

device = MonkeyRunner.waitForConnection()

for i in range(3):

     #start to call

    device.shell("am start -a android.intent.action.CALL -d tel:10086")

     time.sleep(10)

     device.touch(271,799,'DOWN_AND_UP')

     time.sleep(3)

     device.press("KEYCODE_BACK",'DOWN_AND_UP',"")

     device.press("KEYCODE_HOME",'DOWN_AND_UP',"")

     time.sleep(3)