Hi Suresh,

Please share where you are currently residing and if AT&T services are avilable over there. Also share if you have taken any broadband service contract from AT&T or not. Dell Studio 1558 is shipped with following two WWAN cards:

• Dell Wireless 5620 Mobile Broadband Mini-Card
• Dell Wireless 5540 HSPA Mobile Broadband Mini-Card

Please share which one is installed on your system. You may check it in Device Manager. Here are the steps to access Device Manager:

• Press the key combination Windows Logo key + R key to open Run dialog box.
• Type in devmgmt.msc and click OK.
• The Device Manager windows will appear.
• The card will be listed under Ports (COM & LPT) or Universal Serial Bus Controller if its drivers are installed else it will appear under Other Devices with a yellow bang on it.

Also, share the Operating System installed. You will also need to install the Dell Mobile Broadband Manager application. Here are the steps:

• Click on the below link: http://dell.to/18NmI2D
• Enter the Service Tag of your system and select the operating system.
• Dell Mobile Broadband Manager application will be listed under 'Applications'.
• Download and install it following the onscreen instructions.

Please reply with the informtion, will take it further from there.