I have downloaded .jar of BT-F(MagicBlueHack)software.By using that software I can see mobile phonebook,Inbox etc.of other mobile.In short we can read Inbox of other mobile.Then how it is possible to read default Inbox of mobile.Bcoz as per I know we cant read mobile Inbox using J2ME.
"Magic Blue Hack" does not really hack anything at all. It establishes a Bluetooth connection to another device, which the user of the other device must accept. Many devices allow connected Bluetooth devices (such as car-kits) to access their phone book or inbox, to provide hands-free operation. MBH simply uses the appropriate protocols. So, no magic, and no hack. Just blue.
This is not really a back-door to access your devices inbox from a Java application. I doubt you can establish a Bluetooth connection to your own device.
AT commands are not related to J2ME. They are a protocol used when communicating between a pc and a modem (or a mobile phone). They are used through cable, IR or BT connections. They're called "AT commands" because they always start with "AT". "AT" is for "attention". They're also known as the "Hayes protocol", because they originate from the modem manufacturer Hayes.
AT DT +1234567890
is the command to dial (D for dial) a phone number, and initiate a data connection.
Mobile phones often also have AT commands for accessing other features, such as sending text messages, reading the inbox, phone book, etc.