In the main menu, tap Settings
Check that Cellular Data is turned on.
Tap Cellular Data Options and then Cellular Data Network.
(If this setting does not appear on the device, it has not unlocked and settings cannot be configured manually.)
Go to Cellular Data section and enter below information
Go to LTE Setup (Optional) section and enter below information
APN: (Leave Blank)
Username: (Leave Blank)
Password: (Leave Blank)
Enter the below details in MMS section:
MMS Proxy: 10.0.0.200
MMS Max Message Size: 1048576
MMS UA Prof URL: http://www.apple.com/mms/uaprof.rdf
Press the Home button to save the APN and exit to the main screen.
Restart the device.