[FearL0rd]

1 - Go to Settings
2 - Update & Security >> For Developers
3 - Enable Developer Mode
4 - Enable Device Discovery
5 - Install Visual Studio 2013 in the computer
6 - Connect the phone on the USB
7 - Open the XAPDeploy "C:\Program Files (x86)\Microsoft SDKs\Windows Phone\v8.0\Tools\XAP Deployment\XapDeploy.exe"
7.1 - Download Root_Tool.xap http://forum.xda-developers.com/wind...ws-10-t3178140
8 - Deploy the APP Root_Tool.xap using XAPDeploy
9 - Open the deployed Root Tool
10 - Go to the Lumia Registry Tool
11 - Check HKEY_LOCAL_MACHINE and DWORD
12 - Type this in the path Software\Microsoft\Cellular\MVSettings\IMSISpecific\Default\CellUX
13 - Type this in the Key HideMMSAPN
14 - Tap on Read
15 - Change the value to 00000000
16 - Tap on Write
17 - Now go to the Settings>>Network & Wireless>>Celular & SIM
18 - Select your SIM>>Properties
19 - Goto MMS APN>>Add an MMS APN
---- These settings are carrier specific ----
20 - Profile name = T Mobile
21 - APN = fast.t-mobile.com
22 - MMSC (URL) = http://mms.msg.eng.t-mobile.com/mms/wapenc
23 - Save
24 - Apply the settings
---------------------------------------------------
25 - Disable Developer Mode

Credits:
djamol for Root Tool
[JAILBREAK][GUIDE] Interop Unlock for Window… | Windows 10 Development and Hacking | XDA Forums
VCfan for the VCReg registry editor
http://forum.xda-developers.com/wind...terop-t3135326

Enjoy!!!!!!

[Rhoyz]

Nice find!

[shantahan]

Worked great for me! Thanks!

[FearL0rd]

Worked great for me! Thanks!

Welcome

[Alienhead95]

I changed the registry to make my ICON look like the 925 to the store to let me install the T-Mobile wifi calling app. But that did not work. I tried changing the carrier value, but that didn't work either. Anybody have any other ideas?

[FearL0rd]

I changed the registry to make my ICON look like the 925 to the store to let me install the T-Mobile wifi calling app. But that did not work. I tried changing the carrier value, but that didn't work either. Anybody have any other ideas?

I think it needs a driver that is not delivered with the app

[Alienhead95]

Did you try installing it though?

I think it needs a driver that is not delivered with the app

[FearL0rd]

Did you try installing it though?

I did a long time ago when was available without any hack

[Alienhead95]

Oh, ok. Thanks.

I did a long time ago when was available without any hack

[shawns77]

I keep getting an error every time I try and deploy the xap. This was found under 8.1. There was no deployment under 8.0. Could there be another version I need to use?? I'm using Visual Studio Ultimate 2013 Version 12.0.40629.00 Update 5

[shawns77]

My phone OS is 10.0.10512.1000

[FearL0rd]

I keep getting an error every time I try and deploy the xap. This was found under 8.1. There was no deployment under 8.0. Could there be another version I need to use?? I'm using Visual Studio Ultimate 2013 Version 12.0.40629.00 Update 5

Please certify that the develop mode is on

[jrjr488]

I'm getting the same error message as shawns77

http://forums.windowscentral.com/att...214t-error.png

[FearL0rd]

I'm getting the same error message as shawns77

http://forums.windowscentral.com/att...214t-error.png

This problem only happens when you have problems turning on the developer mode

[j o e l]

Non-programmer here, just a guy who wants to send pictures through mms. I followed the link to download "root_tool.xap" but ended up downloading "roottool.zip". I unzipped the file into a folder and tried to deploy. Problem is the deploy cannot find the file called "roottool.xap". There is no .xap file anywhere. What am I doing wrong? Helppp!

[Alienhead95]

Use firefox to download the file.

Non-programmer here, just a guy who wants to send pictures through mms. I followed the link to download "root_tool.xap" but ended up downloading "roottool.zip". I unzipped the file into a folder and tried to deploy. Problem is the deploy cannot find the file called "roottool.xap". There is no .xap file anywhere. What am I doing wrong? Helppp!

[j o e l]

It works! Firefox did the trick. Thanks Alien.

[anon(5334066)]

Has anyone been able to get this working on 10549? I have successfully performed the interop unlock and enabled the ShowMMSAPN key in the registry and properly configured the settings for my carrier, but MMS will not send... A few minutes after I press send, it pops up three times saying it could not be delivered.

Anyone?

[j o e l]

My Icon is on 10549. I installed the interop using the instructions above and MMS works!

[dakranii]

I'm assuming this would work on a 928 as well? Curious as this is my first time noticing this, does mms not work on the preview builds or is this a carrier thing?

[shawnmos]

Does internet sharing work?

[shawnmos]

Which version of Visual Studio do I need to install and what components? Do I need to install the whole 15gb??

[FearL0rd]

Which version of Visual Studio do I need to install and what components? Do I need to install the whole 15gb??

I have the complete Visual Studio 2013 with Windows Phone part loaded.

[shawnmos]

Took 2 hours to install Visual Studio 2013 on my laptop, but this worked. Thanks!!!

[TrueMetalGeek]

Dang I fought this thing since last night. Turned out that the .xap files I downloaded were being changed to .zip by using Edge (Internet Explorer).
I finally found that out and downloaded with Firefox to keep them as .xap files.

Just got MMS working with my ICON on T-Mobile. Sweet.
Now to do the same to the daughter's ICON as well when she gets home.