I use and AT&T lightning card and was running vista. I got the famous local only and after many days on the phone with AT&T crossing my fingers and praying will only connect in 2g only. Disable ip6, disable all other network devices, nothing works. Update firmware and try sierra's connection software, still same. Upgrade to 7 (clean install) as AT&T said this issue does not exist in 7. I guess I was the first to tell them it does. Same thing, 3 g only or let the software negotiate 2g or 3 g and the software says I am connected, but can not browse. Switch to 2g only and connects fine.

Hi, Since the AT&T lightning card is a third party hardware which we do not have enough knowledge about it, to troubleshoot the issue, it’s highly recommended to contact AT&T support for further assistance. Thank you for your understanding. Meanwhile, based on my research, I would like to share you the following article to troubleshoot the issue. AT&T Lightening and Dell Netbook w Windows 7 Note: The third-party product discussed here is manufactured by a company that is independent of Microsoft. We make no warranty, implied or otherwise, regarding this product's performance or reliability. Regards, NovakPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.