We are using sony z2 android. We got the sim card from jb sentral digi store which told us that it is activated and wait 10 mins. It was around 10am at that time. After a long while like all the way to evening we found that there was still no internet thought it was unactivated. Basically here I will list down as how it says in thw prepaid instructions how to activate. 

Step 1 call 016 221 1800 to activate sim card

Step 2 select your preferred language and press 1 to activate 

Also what we found out later that you need to