Send the sms when raspberry registered any movement. For sms sending I use free Twilio trial

raspberry_pir_sms_twilio

import RPi.GPIO as GPIO
import time
from datetime import datetime

def SendSms(msg):

    from twilio.rest import TwilioRestClient

    client = TwilioRestClient("Your ACCOUNT SID",
                              "Your AUTH TOKEN")

    client.messages.create(to="Your number",
                           from_="Your Twilio number",
                           body=msg)

#number of GPIO on board
sensor = 4

GPIO.setmode(GPIO.BCM)
GPIO.setup(sensor, GPIO.IN)

delay_sec = 120
mark_time = 0
cur_state = 0

while True:
    time.sleep(1)
    cur_state = GPIO.input(sensor)
    print(cur_state)
    if cur_state == 1:
        if time.time() - mark_time > delay_sec:
            msg = "Some movement. Time: {0}".format(str(datetime.now())[:-7])
            print(msg)
            SendSms(msg)
            mark_time = time.time()