diff --git a/week3/call.py b/week3/call.py
new file mode 100644
index 0000000..d710f34
--- /dev/null
+++ b/week3/call.py
@@ -0,0 +1,29 @@
+from sim800l import SIM800L
+import logging
+import os
+import time
+#logging.getLogger().setLevel(5)
+
+sim800l = SIM800L(port='/dev/serial0', baudrate=115000, timeout=3.0)
+print(sim800l.command("ATS0=0\n"))
+time.sleep(2)
+print(sim800l.command("AT\n"))
+time.sleep(5)
+print(sim800l.command("AT+DDET=1"))
+time.sleep(3)
+
+while True:
+	activecall = sim800l.command("AT+CPAS\n")   #check if someone is calling or not
+	if "+CPAS: 3" in activecall:                #if someone is calling
+		print("some one is calling")          
+		time.sleep(3)                       #wait 3 seoncds
+		sim800l.command("ATA\n")            #answer the phone
+		print("playing sound file")
+		os.system("play test.wav &")
+		while True: 
+			#check if call is still active
+			callisactive = sim800l.command("AT+CPAS\n")
+			if "+CPAS: 0" in callisactive:   #call is not active anymore
+				print ("call stopped")
+				os.system("killall play")
+				break