Open Settings and select Cellular Data
Turn on Cellular Data, then click APN Settings
Enter following information under Cellular Data

APN: telia
Username:
Password:
This version of iPad does not support MMS. However below are MMS settings in case you setup via a 3rd party app.
APN: telia
Username:
Password:
MMSC: http://mm/
MMS Proxy: 212.169.66.4:8080
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.