Note: You cannot activate 3G on Slate S5 that is programmed for 3G services, if you do not have the correct type of SIM card and/or 3G data plan activated by the network service provider.
Step 1:
Click on the App drawer menu
Step 2:
Click on settings
Step 3:
Click on More options
Step 4:
Click on Mobile Networks
Step 5:
Select 3G service
Step 6:
The available 3G network on the tablet will be displayed click to enable 3G.