Hi srinivas,
Compared to Port Moresby all other places living cost is lesser. The concept of unlimited intenet is not applicable to individuals as 1 MBps unlimited connection is costing around 2000 Kina in Port Moresby, should be the same there too i guess. Normally 1.5GB internet is 60-70 Kina here. In most of the places mobile internet is good.
If you are going to cook then it will cost you around lesser than 250 Kina.
Regards
Sobhan Babu