Mobile carriers fault as always with their bloatware and editing android system settings for marketing purposes. If you are familiar with "root" then thats the only best option to get that system shortcut there. Otherwise, a third party (mobile guru) would help you.
I do not recommend a root as sidre recommended it will void your warranty. I work for a mobility carrier in Canada and I had a customer who rooted his phone and tried to unlock it. The root affected his unlocking ability for his S6. When we sent it for repair to Samsung, they detected it was rooted and it voided his warranty. He had to pay over $500 to fix the problem and to make his phone unlockable again.
Root no longer required for android 6.x or 7.x. More technical but simple in my opinion.
First, download the ADB binary straight from Google (developer.android.com/studio/releases/platform-tools.html). Then, enable “USB Debugging” and "OEM unlock" in Settings –> Developer Options. Finally, Open terminal/command prompt and reference in the same directory as the ADB binary (cd c:\adb ) then run the following command:
adb devices
If you see your device’s serial number (and it doesn’t say unauthorized), you’re good. After you approve the popup on your galaxy device.
To enable Mobile Date toggle. First, enter the following command to enter ADB shell:
adb shell
Your terminal/command prompt should now show that you are within the shell environment of your device. Once you’re in, enter this next command:
settings get secure sysui_qs_tiles
Displayed are your current Quick Settings tiles. Copy this list down (save it in your clipboard, to a text file, whatever.) Next, enter the following command:
settings put secure sysui_qs_tiles "YOURCURRENTLIST,MobileData"
The YOURCURRENTLIST represents your comma separated list of Quick Setting tiles that you saved just before and MobileData.
Once you enter this command, you should immediately see the Mobile Data toggle show up. This toggle will persist through reboots, but won’t survive a factory reset.
Hi guys, here’s a workaround to get the mobile data icon. From your Galaxy Apps Store, search for and install "Good Lock" by Samsung. Good lock replaces the System UI for things like Notification Shade, Lockscreen, and Recent Apps etc. (It looks very similar to Vanilla Android and is super customizable!). Tapping the Good Lock settings icon after dragging down the notification shade > Advanced, will allow you to set your quick shortcuts.
