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tfw

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 Files\iTunes"
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
button2
filer2
After I installed TFW 15.6, I needed to go to Settings->General->Reset->Reset All Settingsbefore the 3G indicator would change back to 4G.