How to Unlock Your CDMA HTC (SPRINT) Diamond

by Jeremy on April 14, 2009

Intro Fluff:

These simple instructions will also work for Alltel, Cellular South, Bell, MTS, and Telus CDMA Touch Diamond Devices.

If you have a GSM device do NOT follow the instructions below. Following the instructions below will ruin all GSM Devices.

***WARNING: The instructions below are likely to remove the information & contacts currently stored on your Touch Diamond.

Learn How To Backup Your Contacts

How To Do It:

1.       Make sure you have either ActiveSync (XP) or MWMDC (Vista) installed on your computer. 
(How to Download and Install ActiveSync | How to Download and Install MWMDC)

2.       Make sure you have the .NET Framework 3.5 installed on your machine. 
(Download .NET Framework 3.5 | You can check if you already have the .NET Framework 3.5 by going to My Computer > Uninstall or change a program. Then look for “Microsoft .NET Framework 3.5″ in the programs list.)

3.       Plug in your Touch Diamond and verify that it is connected via ActiveSync. If an ActiveSync graphic dialogue box pops-up, simply ignore it.

4.       Download the Diamond Unlocker application.

5.       Unzip Diamond_Unlocker.Rar (How Do I Unzip a folder?)

6.       After unzipping the folder, find Diamond_Unlocker.exe and run this file by double-clicking it. (Make sure your device is plugged in to the computer and you have an ActiveSync connection with it.)

7.       Follow the instructions that the Unlocker application provides from this point on.

8.       Your screen will change color.

9.       The device will restart.

10.   Your device is unlocked!

Verify the device is unlocked:

You can verify that your device has been successfully unlocked by following these 5 steps:

1.       Turn the device off

2.       Hold down the Power Button & Volume-Down button at the same time.

3.       If you have unlocked the device successfully it will say “SECURITY UNLOCKED”.

4.       Congrats!

5.       To get off of this screen, soft-reset your device by inserting the stylus tip into the reset hole under the hard cover of your diamond.

 For Used Devices:

1.       Hard Reset your diamond before performing the unlock operation. (How Do I Hard Reset My Sprint Diamond?)

2.       See steps 1-10 above.

If you have any questions or comments, leave them in the comments section below!

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{ 22 comments… read them below or add one }

vishal June 15, 2009 at 1:49 pm

hi, i have a palm treo pro 850 cdma sprint locked… how can i unlock it to use it in india reliance network?


Nathan June 16, 2009 at 7:39 am

I’m actually not sure. I just did a little research and haven’t seen anyone that has released an unlocker for the CDMA Treo Pro 850. Maybe someone else here knows.


agung August 27, 2009 at 1:05 am

hi, i just bought sprint HTC diamond cdma on ebay, and i could use it in indonesia but when i try to connect to the internet, it always dial to the sprint network. can you tell me how to unlock the internet setting?

if you dont mind, please answer to my email. thanks


Jeremy September 19, 2009 at 3:16 pm

Not sure, bro.

Can anybody help out agung?


Summer September 23, 2009 at 1:37 pm

I just bought a used Touch Diamond from a guy. Can someone please explain to me what “unlocking” a phone does? Any information is appreciated. Thanks


Jeremy September 23, 2009 at 2:35 pm

Hey Summer,

Unlocking the phone allows you to put customized ROM’s (basically customized operating systems) on your Diamond.

The customized ROM’s are usually a TON faster than the stock Sprint ROM, and they usually make the battery last longer because they person that “cooked” it had efficiency in mind.

You can check if your phone is already unlocked by doing the following: 13. Entering the Bootloader (Power+VolumeDown and hold down Reset) – taken from this post on

Hope that helped at all.

You can find custom ROM’s to flash to, as well as more in-depth information about the whole process here:


Puneet October 21, 2009 at 9:48 am

I am planning to buy a Sprint HTC Touch Diamond on eBay. After unlocking it will I be able to use it with Reliance(CDMA) Network in India?


HTC November 20, 2009 at 6:59 am

OH, Wow I wanna thanks to you because you have given a lot of information for the users of this HTC. thanks again


Frank Grimes November 30, 2009 at 11:24 am

This is great information. Stupid question- If I do this on a Sprint HTC Touch Diamond, will it then be able to be used with Verizon? Thanks.


bboy December 15, 2009 at 7:54 pm

I have an old HTC touch Diamond from sprint, and i was wondering if i unlocked it, if it could work with t-mobile? thanks for the help


shnnn January 23, 2010 at 10:27 am

I receive a pop-up that says “this file does not have a program associated with it for performing this action. Create an association in the Set Associations control panel” whenever I try and download the Diamond Unlocker application….HELP!


Robert February 17, 2010 at 7:24 am

Hello there can anyone tell me if this “Sprint” unlock will work on a “TELUS” HTC Touch Diamond? I am in dire need to know and thanks. Everybit of help is greatful.


Jason October 22, 2010 at 7:07 pm

it worked for mine…but not sure what the benefit is….


Tarun May 17, 2010 at 6:57 am

I have bought a Sprint HTC Touch Diamond on eBay. After unlocking is it will I be able to use it with Reliance(CDMA) Network in India? Pls help


nitesh June 12, 2010 at 4:40 am

if my diamond is unlocked(cdma SPRINT) will it work on RELIANCE (cdma) or any other cdma network in INDIA.PLEASE REPLY


Jeevan July 28, 2010 at 12:03 pm

hey broo, i tried doing these steps, have an sprint diamond from ebay trying to unlock to FIdo Or Rogers Canada – tried these steps saisss rapitoool stopped working during the proces and then “ERROR(260) : Connection), everything is plugged in right …., hellp me out brooo


Mohit Goyal August 10, 2010 at 11:11 pm

hello, i have an htc touch diamond..its a cdma i bought it from MTS canada..i m in india if i unlock my phone using these steps given above after that how will i get a reliance network in the i have to go to reliance shop and tell them to flash it…please help me out …


arsu October 5, 2010 at 8:54 am

Dear sir,
we have purchased on HTC touch diamond p3700 ,that is worked GSM,BUT need me CDMA RELIACE CAN I ABLE TO SHIFT THE NETWORK? i am india


chris December 2, 2010 at 5:08 pm

i have a thc diamond how can i reset all my password i just got back in town and i can not remember my passwords to get in my phone when i first turn it on


rancy May 14, 2011 at 3:12 pm

hello i have the verizon htc touch diamond which uses CDMA not gsm can i use this


Baumtgarner July 15, 2011 at 10:11 pm

Thanks bro………


dboy August 3, 2011 at 3:12 pm

i have a htc touch diamond and i want to know if it can work under the sim card Simple Mobile?


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