I found a way to restore Carrier TFW 15.6 to my iPhone. I don’t have the speed issue so I can’t say doing this will fix the problem. I also cannot promise doing this won’t cause you further problems. I can only tell you I did this to my iPhone 5. My carrier now shows TFW 15.6. My iPhone asks me to update. I presume to TFW 15.7 again. I still see the 3G when I MMS or go to voice mail, places I used to see a 4G. My phone shows LTE the rest of the time. I don’t notice or measure any difference in my speeds with or without 15.7. Try this at your own risk.
NOTE: This currently only works for iOS 7.0.x, not iOS 7.1. I am looking to see if I can find a way to do it. If or when I find a way, I’ll update this post. Please don’t leave a comment asking about it.
I recommend running a few speed tests before and after. Also after installing the profile, do a reset all settings on your iPhone.
Please leave a comment and let me know how it went.
Regards
Bob
Download Carrier Update TFW 15.6 to your Mac or PC
- From your computer browser, load http://appldnld.apple.com/iOS7/CarrierBundles/031-0815.20131022.815mb/ATT_TFW_US_iPhone.ipcc
- Your browser should download a file ATT_TFW_US_iPhone.ipcc to your computer
NOTE: It seems Internet Explorer changes ATT_TFW_US_iPhone.ipcc to ATT_TFW_US_iPhone.zip. You will need to remane the file back to ATT_TFW_US_iPhone.ipcc.
Modify iTunes
By default, you cannot install a carrier update file with iTunes. You need to enable the feature from your computers Terminal or Command Prompt. See the appropriate instructions for your Mac or Windows PC below.
Mac Users
defaults write com.apple.iTunes carrier-testing -bool true
Windows (32 Bit) Users
- Open a Command Prompt
- Copy and paste the first line below on to the Command Prompt and press enter
- Copy and paste the second line below on to the Command Prompt and press enter
cd "C:Program FilesiTunes"
iTunes.exe /setPrefInt carrier-testing 1
Windows (64 Bit) Users
- Open a Command Prompt
- Copy and paste the first line below on to the Command Prompt and press enter
- Copy and paste the second line below on to the Command Prompt and press enter
cd "C:Program Files (x86)iTunes"
iTunes.exe /setPrefInt carrier-testing 1
Install TFW 15.6
- Launch iTunes
- Hold the Option (ALT) (Mac)
- Hold the Shift key (Windows)
- Click the Check for Update button
- Select and install ATT_TFW_US_iPhone.ipcc
After I installed TFW 15.6, I needed to go to Settings->General->Reset->Reset All Settings before the 3G indicator would change back to 4G.
References:
http://www.howardforums.com/showthread.php/1816504-Current-Status-of-AT-amp-T-SIM-Cards-from-ST
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