Back when I did my Qualcomm modems and transceivers piece, I gained a deeper understanding about the cellular RF engineering side of the handset puzzle. Specifically, how an OEM can enable LTE on some bands and not enable WCDMA on those very same bands. The interesting and relevant takeaway from the whole exploration is that all ports on the transceiver are created equal, and that if an OEM implements LTE on a particular band, that usually means that the device design can inherit support for 3G WCDMA on that same band, given the right power amplifier. I alluded at the end of the article to the fact that if you see an OEM implement band 4 on LTE and not band 4 on WCDMA, it's just a matter of a firmware lock and appropriate certifications to enable it, and what I was alluding directly to was the A1428 iPhone 5.

Today T-Mobile USA formalized their LTE plans and announced that the Samsung Galaxy Note 2 (as predicted), Blackberry Z10, and Sonic 2.0 hotspots would immediately work with their Band 4 LTE which is either 5 or 10 MHz FDD depending on market. In addition the upcoming HTC One and Samsung Galaxy S 4 will support T-Mobile LTE. The operator also launched its LTE network in Baltimore, Houston, Kansas City, Las Vegas, Phoenix, San Jose, Calif., and Washington, D.C. I plan to drive up to Phoenix at some point this week and test the network out there. 

Among all that other news however was news that T-Mobile would finally be carrying the iPhone 5, specifically an updated version of the A1428 hardware model which included Band 4 (AWS) LTE support. This was the variant aimed at AT&T specifically, with both Band 4 and Band 17 LTE included, in addition to a number of other bands as we noted in the iPhone 5 review. As I mentioned earlier, what's interesting about A1428 is that it always had the necessary power amplifiers for AWS WCDMA, but only enabled it on LTE. The hardware could support AWS WCDMA, but that was locked out in firmware — until now. Apple gave a statement to Engadget which confirmed my earlier suspicions – beginning 4/12, Apple will ship a new A1428 with different firmware onboard that enables AWS WCDMA. There won't be any software update for existing A1428 owners, meaning if you bought an iPhone 5 AT&T model, you're not going to be able to get AWS WCDMA on T-Mobile overnight unfortunately, instead new shipping A1428 models will simply have different firmware on them which enables the AWS paths through the transceiver for WCDMA to be enabled. I'm unclear how Apple will choose to differentiate the two identical A1428 hardware models for users or on their own spec lists, either way there will be an old version and new version which differ in this regard. In addition, existing A1428 hardware without AWS WCDMA support will be phased out.

In fact, there's the same FCC-ID for the A1428 with AWS WCDMA enabled, it's still BCG-E2599A. I was surprised to see that Apple has already in fact processed the Class II Permissive Change and added Band 4 (AWS) WCDMA tests as necessary, dated today March 26th 2013. 


From the FCC's A1428 Class 2 Permissive Change Cover Letter

So there we have it, the new A1428 with AWS WCDMA for T-Mobile is identical hardware to the previous A1428 hardware, it's just a matter of enabling those modes in the transceiver for WCDMA. The hardware will also support DC-HSPA+ (42.2 Mbps downlink) on AWS, which means speedy fallback if you detach from LTE and are in a T-Mobile market with two WCDMA carriers.

Source: T-Mobile (LTE and Uncarrier), T-Mobile (iPhone 5), Engadget

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  • bh661 - Wednesday, March 27, 2013 - link

    Same here. I hope Apple comes out with an update for current A1428 users. If not, hope it's something the dev community can provide a fix for. Reply
  • hfm - Wednesday, March 27, 2013 - link

    I agree. If it's not even a hardware change just software, why can't I get it on the 32GB iPhone 5 I bought unlocked at an Apple store + AppleCare for $900?! I mean COME ON! That's horrible customer service. When the new version ships I'm going to go to the Apple store and demand the software update or ask for an exchange for a new model 32GB phone that will have software to take advantage of the carrier I am using.

    I just don't get it.
    Reply
  • darwinosx - Friday, March 29, 2013 - link

    Thats because you didn't read and comprehend the article. Reply
  • Brian Klug - Wednesday, March 27, 2013 - link

    Apple has stated there will be no software update for existing users to enable AWS WCDMA.

    -Brian
    Reply
  • nrm590 - Thursday, March 28, 2013 - link

    Thank you Brian, not the answer I wanted to hear but T-Mobile has been moving rather quickly with the 1900 MHz upgrade. I really have no choice but deal with it. I will however be sure to voice my displeasure over this matter to Apple. Reply
  • darwinosx - Friday, March 29, 2013 - link

    Because that won't fix the issue. Reply
  • KPOM - Thursday, March 28, 2013 - link

    I'm guessing Apple and T-Mobile reached an agreement in which Apple would not release a firmware update enabling the DC-HSDPA AWS bands on the existing iPhone 5s. After all, Apple usually requires each carrier to purchase a minimum number of iPhones, and T-Mobile probably prefers that people coming to them buy new iPhones rather than take unlocked AT&T versions. Reply
  • Bob Todd - Thursday, March 28, 2013 - link

    Seems doubtful. T-Mobile is quite happy to have you bring your AT&T iPhone over to their network. They just went through a huge refarming of their 1900MHz network to give AT&T expats 3G on their existing devices. They've openly bragged about how many iPhones they've had on their network for a while now, and those users were suffering with edge up until the refarm. Reply
  • KPOM - Thursday, March 28, 2013 - link

    But that was before they made a commitment to sell the iPhone. Now they have a quota, and as C-Spire found out, meeting it can be easier said than done. Reply
  • stencil - Monday, April 08, 2013 - link

    Last week I traveled from Raleigh NC to Washington DC to Philly, PA. I have a gsm phone on the t-mobile network and never once had a 3g connection on the 1900mhz band. I stood on the Washington mall, right in front of the capital, I also ran to the top of the art museum steps in Philly (yeah, all Rocky-like) and all I ever got was EDGE. So much for their huge refarming effort. Reply

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