Owners of unlocked AT&T iPhone 5 units who implemented the recent carrier update to enable LTE connectivity on the iPhone 5 may have been suffering on slow data speed while using T-Mobile’s refarmed PCS 1900MHz network. Well, don’t lose hope since there is a newfound solution you can use to solve this problem.
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Two mobile geniuses, known by their twitter names @joe012594 and @cooldayr2, managed to hack the carrier update and increased the bandwidth on the handset including T-Mobile and unlocked AT&T iPhone 5 units. The hack results in better data connection and throughput performance that was bogged down by the update. It also works well on both jailbroken and non-jailbroken iPhone 5 units.
There is a complete step by step guide you can implement to recover lost speed on the refarmed 4G HSPA+ network. The fix doesn’t require any jailbreak of the phone and will retain features on the carrier update. In a nutshell, the hack will enable Release 9 DC-HSPA+ on the handset that will result in better data speed that could increase from 3mbps up to 8mbps on the downlink. In addition, it fixes weakened signal experienced by some users on the PCS/AWS bands by setting the band preference to “auto”.
If you have questions about the procedure/setup, you may forward your questions here.