diff --git a/usb_application/phone.py b/usb_application/phone.py
index 830e3a0b..aae6a415 100755
--- a/usb_application/phone.py
+++ b/usb_application/phone.py
@@ -6,6 +6,7 @@ import sys
 
 # SuperSIM ATR
 atr= [0x3B, 0x9A, 0x94, 0x00, 0x92, 0x02, 0x75, 0x93, 0x11, 0x00, 0x01, 0x02, 0x02, 0x19]
+RESP_OK = [0x60, 0x00]
 
 def find_dev():
     dev = usb.core.find(idVendor=0x03eb, idProduct=0x6004)
@@ -45,28 +46,54 @@ def find_eps(dev):
     print(ep_out)
     return (ep_in, ep_out)
 
-def emulate_sim():
-    dev = find_dev()
-#    (epi, epo) = find_eps(dev)
+def handle_phone_request():
+    # ATR handling
+    try:
+        arr = dev.read(0x83, 64, 100)    # Notification endpoint
+        print("arr: ", arr)
+        c=arr.pop()
+        print(c)
 
-    while True:
-        #ep_out.write("Hello")
-        try:
-            # ATR handling
-            arr = dev.read(0x83, 64, 1000)    # Notification endpoint
-            print("arr: ", arr)
-            c=arr.pop()
-            print(c)
-            if c == ord('R'):
+        if c == ord('R'):
+            try:
                 written = dev.write(0x1, atr, 1000)     # Probably we received a Reset, so we send ATR
                 print("Written data: " + written)
-            
+            except:
+                print("Timeout sending ATR!")
+                return
+
+    except:
+        #print("Timeout receiving atr!")
+        pass
+    
+    # Read phone request
+    try:
+        cmd = dev.read(0x82, 64, 10000000)
+        print("Received request!: ")
+        print("".join("%02x " % b for b in ans))
+
+        print("Write response");
+        try:
+            written = dev.write(0x01, RESP_OK, 10000000);
+            print("Bytes written:")
+            print(written)
+        except:
+            print("Timeout in send response")
+    
+    except:
+        #print("Timeout in receive cmd")
+        pass
+
+
+def emulate_sim():
+    dev = find_dev()
+
+    while True:
+        try:
+            handle_phone_request()
 
-            ans = dev.read(0x82, 64, 1000)
-            print("".join("%02x " % b for b in ans))
         except KeyboardInterrupt:
             print("Bye")
             sys.exit()
         except: 
             print("Timeout")
-    #    print(ep_in.read(1, 5000));