I'm using Samsung Note 3 N900 model and i want to make sure i don't connect to internet but continue to make calls & SMS/MMS. Believe this is opposite the query of others.
Option 1 (no data at all)
Settings --> More Settings --> Mobile Networks --> uncheck "mobile data"
The device will no longer connect to the internet, but continue to receive calls & text. MMS are not possible.
Option 2 (data only for mms)(source)
Settings --> More Settings --> Mobile Networks --> Access Point Names --> Select your data APN --> APN Type
Remove in the field APN type everything but "mms". You have to leave "Mobile Data" enabled (see Option 1)
You can have a look at this app