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The process is more or less similar to that of htc one m7. So for those who already unlocked sprint htc one m7 this should be familiar. Requirements: 1. This tutorial is independent of Android version whether it may be 4.4.2 or 4.4.3. Works on both stock and sense based custom ROM's. (Not tested on AOKP ROM's.). Works on both s-off and s-on devices. 2. You need to be rooted and bootloader needs to be unlocked. Here are the links that would show you how to do it. http://theunlockr.com/2014/04/19/root-htc-one-m8-all-in-one-toolkit-method-video/ '> https://www.dropbox.com/s/74r6h5q6ft50z6j/SIM_UNLOCK.zip?dl=0 '> https://www.dropbox.com/s/74r6h5q6ft50z6j/SIM_UNLOCK.zip?dl=0 4. Download and install Terminal from play store. 5. Switch off the handset and boot to fastest.(By holding volume down and power button together ). 6. Once you are on fastboot screen navigate to recovery using volume buttons and press power button to boot to recovery. 7. One you are in recovery click on install (I'm presuming you installed twrp recovery, if not then do it according to that recovery). Now locate SIM_UNLOCK. zip and flash it. Reboot system after successful flash. 8. On Reboot:Open the Terminal Emulator from the app drawer 9. Type - su 10. Hit enter on your keyboard 11. After you see the # type this- am start com.redbend.vdmc/com.htc.omadm.test.TestMainActivity 12. Hit the enter key 13. Next you should see a menu listing 3 options as follows: GUI API ROAMING OPTIONS 14. Select API 15. Once the API menu comes up, scroll down until you see - sim lock 16. Tap- sim lock. Wait until the gray highlight goes away and turns black again 17. Reboot and you are done. 18. If you see you that you have no network then dial *#*#4636#*#*. A menu will pop up. Select phone information then scroll down until you see 'select preferred network type'. Change it to WCDMA preferred and that is. Now your network should pop-up. This is permanent unlock and you can update your Android version in future. Thank you.

RGERUC000xxx series SIM cards do not support Sprint carrier S4 mini/Mega/Note 3/S5. Any RECRUC05/06 normal or micro SIM will work perfectly. RECRUC06xxx will be best suitable. RGERUC series is only compatible with Sprint S4 L720 on any firmware with MDC modem.

Requirements Phone needs to be rooted, How to root here Install Rom Toolbox Lite Run Rom Toolbox Lite, Select Root Browser Select system folder Select app folder Search for OmaDmclient.apk, then click and hold the file till it popups a secondary menu, in secondary menu select RENAME. Rename OmaDmclient.apk to OmaDmclient.apk.bak and press ok. Repeat the same for the below mentioned apk's Activation.apk SPR_Skyfire_observer.apk SPR_Skyfire_Toolbar.apk SprintExtensionProvider.apk SprintID.apk SprintTouch.apk Vtt-Sprint.apk Zone-Sprint.apk xtra_t_app.apk Reboot Phone. DO NOT INSTALL OTA OR UPDATE PHONE WITH THE ABOVE MODIFCATION. If you are on ZV7 or ZV8 and if you receive OTA its very very important to rename all the above apps back to original state and only then install the update.