Door access with nfc phone

Hello ,

I wrote web application to customer make reservation. after reservation customer gets sms include room number and key. But I am confused. How can i reach sms inbox than read that sms and key and send this key to door.
I searched there is no way to reach sms inbox in J2ME and nokia 6131 nfc pones. I am using two 6131 nfc phones. one of them is as a door.

Do you have any idea for reading that key which in sms ? or Is there a another way to make this door access control ?

You can consult with this article
[url]http://wiki.forum.nokia.com/index.php/CS000981-_Listening_for_incoming_SMS_messages:_Asynchronous_version[/url]

Is it possible saving data into internal or external tag in nokia 6131 nfc phone usinng J2SE. And than reading data from internal tag via other nokia 6131 using peer to peer communication ?

If I understand correctly, your case you want to save data in NFC (that is not supported with C7) with S40 might support (I am not sure 100%)
Have you looked with there's JSR-257 API ?

if I am not wrong, Nokia 6131 nfc supports writing data to mifare 1K. But I dont know how can i write ? :/ Firstly, i tried to execute these examples "InternalSecureCardExample"
" TicketingExample" and " MFStandardExample" which comes with nokia sdk, but I gets java.lang.security exception error. These work correctly on emulator but it gives error in real phone. I searched it in forum and i think, i need to sign my midlet. but i dont know how can i sign midlet . how can i solve this problem ?