Hi guys!
Here I present to you a simple modification I have done in my S3.
THIS IS MY FIRST THREAD.
Actually this is just for my personal enjoyment but I decided to share it here in case anybody is interested.
I modified the SystemUI.apk on my phone running Back-to-N00t V6 from the usual 3G icon to this:

I resized the icon to match the display since from the source where I got the icon it is in xxhdpi whereas in Back-to-N00t ROM it is in xhdpi only.
HOWEVER, if you are interested, download the file below:
View attachment SystemUI.apk
If you prefer H+ icon, download this file:
http://forum.xda-developers.com/attachment.php?attachmentid=3101092&d=1420550912
Instructions
1. Copy the file to your device.
2. I personally use Root Explorer, but if you have another file manager that can access system files, you can use it.
3. Put the file to /system/priv-app.
4. Set permissions.
5. Reboot.
6. You're good to go! HAHA!
If you are asking if this will work in versions 1-5 then my answer is
I DON'T KNOW.
If you want to, then you try but make sure to make a BACKUP first in case something goes wrong.
HIT THANKS IF YOU LIKE MY WORK!
All credits to @sunajkram23 to where I got the LTE icon (from his ROM) and to @arter97 for his amazing ROM.
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