CheckESNFree.com can now validate against the new US IMEI/LTE Blacklist Database.

However, there are a few things that might not please most of you.

Per the requirements of the carriers and the global GSM association, only IMEIs registered as "lost/stolen" AFTER October 31st 2012 on T-Mobile and AT&T are listed in the US blacklist database.

This may change down the road to include all blacklisted devices, but currently it is as mentioned above.

With that said, any device blacklisted before October 31st 2012 on AT&T may still be used on T-Mobile, and vise-verse.