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Source by theotherguy All credit goes to hotaru2k3 and Rimidal from XDA First off you need to be on stock sprint rom or base for this to work. Also it will work on bad esn phones If you are on KitKat 4.4.2, scroll all way to end of this post, follow the procedure then follow the steps mentioned below. 1. You should be rooted 2. Download Termnial Emulator 3. Run Terminal Emulator 4. Type "su" (excluding quotation marks) and grant it superuser permission 5. Type "am start com.redbend.vdmc/com.htc.omadm.test.TestMainActivity" (excluding quotation marks) 6. You will get menu on your HTC 7. In that menu, select "API", then scroll down 'till almost end and select "simlock" 8. Reboot the phone and hopefully it would accept GSM SIM 9. Enter *#*#4636#*#* in your dialer 10.In the phone information section(the first one) set preferred network type to something that is GSM specific: "WCDMA Preferred", for example. The phone will switch to GSM mode How to Video Recognized Developer -viperboy- from XDA has developed a app for the above procedure.Source to his thread on this app. How to find SPC or MSL without root, Credits to HetalDP 1. Uninstall all HTC drivers 2. Reboot 3. Install Install HTCDriver_4.2.0.001.exe 4. Install WModem_Driver_Installer_v3.0.2.0.rar 5. Dial ##SERIAL# and Put it ON , HTC Modem Drivers will be loaded. 6. Once Installed Start HTC-One-MSL.rar (Required Microsoft .Net 2.0) 7. Select Proper HTC Modem Port and Hit READ How to unlock if you are on KitKat 4.4.2 (source) credits to maniac8828 for doing it.