First off, I had absolutely no luck with any of the other methods mentioned on the forum, so I decided to write up how I (finally) managed to get my HTC one to work with an AT&T GoPhone sim card.
1.) Get Sunshine for S-Off, I wasted 3 days trying to find a way around paying for it, but finally caved.
2.) SuperCID: fastboot oem writecid 11111111
3.) Flash the RUU from this guide: http://forum.xda-developers.com/show....php?t=2586704 or here: http://click.xda-developers.com/api/...651.10_RUU.zip
- I had to fastboot oem rebootRUU then fastboot flash zip RUU.zip
- Check to be sure HBOOT is downgraded to 1.44
4.) Be sure to root the device, either using custom recovery or TWRP app from play store
5.) Run the sim unlock helper available here: http://forum.xda-developers.com/atta...5&d=1414183159
6.) Here's the one part that isn't widely mentioned for the specific issue I ran into with this unlock: You need a sprint sim card to "trick" the phone into searching for networks.
- Type in *#*#INFO#*#* (*#*#4636#*#*) and change your network to WCDMA preferred
- Be sure that the Sprint sim card is in the phone
- Go to Settings -> Mobile Data -> Network Mode and set to GSM/UMTS Only (You should have no signal or bars with X above them)
- Click on Available GSM networks -> Select Automatically
- Switch the SIM for the AT&T Sim (It will show 'no sim warning') while it is searching and then click on Available GSM networks -> Search networks
- Select AT&T (or Maritime)
- Device will register, however, the settings are lost on restart and I haven't managed to get data yet. (If anyone can help with this, I'd greatly appreciate it!)
1.) Get Sunshine for S-Off, I wasted 3 days trying to find a way around paying for it, but finally caved.
2.) SuperCID: fastboot oem writecid 11111111
3.) Flash the RUU from this guide: http://forum.xda-developers.com/show....php?t=2586704 or here: http://click.xda-developers.com/api/...651.10_RUU.zip
- I had to fastboot oem rebootRUU then fastboot flash zip RUU.zip
- Check to be sure HBOOT is downgraded to 1.44
4.) Be sure to root the device, either using custom recovery or TWRP app from play store
5.) Run the sim unlock helper available here: http://forum.xda-developers.com/atta...5&d=1414183159
6.) Here's the one part that isn't widely mentioned for the specific issue I ran into with this unlock: You need a sprint sim card to "trick" the phone into searching for networks.
- Type in *#*#INFO#*#* (*#*#4636#*#*) and change your network to WCDMA preferred
- Be sure that the Sprint sim card is in the phone
- Go to Settings -> Mobile Data -> Network Mode and set to GSM/UMTS Only (You should have no signal or bars with X above them)
- Click on Available GSM networks -> Select Automatically
- Switch the SIM for the AT&T Sim (It will show 'no sim warning') while it is searching and then click on Available GSM networks -> Search networks
- Select AT&T (or Maritime)
- Device will register, however, the settings are lost on restart and I haven't managed to get data yet. (If anyone can help with this, I'd greatly appreciate it!)
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