“This hack enables Release 9 DC-HSPA+ on the iPhone 5 and iPad 3, 4, and mini as well as enhancing LTE data and signal. Though AT&T is limited to HSPA+ 21, the device itself becomes more open to an increased amount of bandwidth thus allowing for better throughput of data and data connection. This is very convinient for users in areas that don’t yet have LTE coverage.”
So in case you want to try the hack way on your iPhone, you can go to the following guide on your own risk, but we are not responsible for anything happen to your iPhone as we haven't tested this hack. The tutorial is entitled ‘AT&T iPhone 5 Hacked Carrier Update,’ but it appears it’s also compatible with the Cellular versions of the iPad 3, iPad 4 and iPad mini as well.“The issue was due in part to the newer revised iPhone 5′s that came with the AWS band enabled for HSPA+, if you were to ever choose to leave AT&T for T-Mobile. It set the band preference for HSPA+ to CLR and LTE to APT which can cause conflictions and problems when you’re in an area with towers on different bands with stronger signal. The setting has been set back to the default “auto” setting and should help the 4G HSPA+/LTE signal perform a bit better, whether your iPhone 5 is the older edition or the revised edition.”
We haven’t tried this ourselves yet, so I can’t speak to its effectiveness. I will say, though, that it didn’t seem like many of our readers had success with last week’s T-Mobile update. If you decide try it, be sure to let us know how it goes in the comments below..