why can't i activate my data usage on my iphone 4s

[iMore Question]

I just got my iphone 4s. I have uncapped Wifi at home but im not able to activate my Data on my phone. Im from South Africa and in using MTN network. I got 1 gig data but still not able to activate the usage. Can anyone help me please

 

[Tartarus]

Contact your carrier on how to configure your iPhone for cellular data use.