There are over a million unlocked iPhones running onUSA's network, and on April 5, America's fourth largest carrier will unlock something else: Speed. The carrier will send out a carrier update that will allow LTE support for LTE-capable devices, according to a report on Tuesday.
Carrier update files are small, and do not involve the ROM. What this means is that the version of iOS on these devices will remain the same: 6.1.3. This carrier update will, however, allow devices such as the AT&Tto run on any LTE networks that T-Mobile might have active across the U.S.
T-Mobile's LTE network is live in seven cities: Baltimore, Houston, Kansas City, Las Vegas, San Jose, and Washington, D.C.
Here's what the leaked document says:
The T-Mobile Carrier Update is a minor iOS software update that enables official iPhone support by T-Mobile. When installed, the software update enables a handful of capabilities like Visual Voicemail, MMS Settings and Network/Device optimizations that customers do not have access to today. On April 5, the software update will begin being pushed via OTA to all iPhone devices on the T-Mobile network with iOS 6.1.x or higher.
Those running jailbroken iPhone 5s, rather than AT&T unlocked or factory unlocked iPhone 5s can resort to the following method, if they don't want to wait for April 5:
In addition to unlocking LTE, the official carrier settings update will enable Visual Voicemail "among other features," which are unspecified.
T-Mobile will begin selling its official iPhone 5 on April 12.
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