Disclaimer:
a) Yes the content is free
b) Unfortunately, there are separate data charges incurred by your operator. This can be expensive so we recommend unlimited data plan.
For other operators, please check your respective websites.

Under its postpaid service, Celcom has Unlimited Plan that costs RM99 per month that includes data and voice.
It also has Unlimited data only package that costs higher at RM120 per month.
Celcom also has 'pay per use' option at 10sen per /10 KB.
For prepaid users, they are given an option to buy a 3G package at RM28 with pre-loaded airtime of RM10.
This package is valid for 30 days only though no matter how less you use it.
For more info

Digi offers several plans. Data Basic Plan costs RM6 for 2MB per month and subsequent charges at 8sen/10KB
Data Lite Plan costs RM22 for 8MB and subsequent charges at 5sen/10KB. Data Unlimited Plan costs Rm66 per month.
DIGI also offers 'Pay As You Use' Plan which is tier charging:
RM0-RM30 10 sen/10KB
RM30.01-RM50 8 sen/10kb
RM50.01-RM149 5 sen/10KB
Above RM149 FREE
For more info

Maxis offers Time Based Passes and Monthly Passes.
TIME BASED PASSES (Postpaid & Prepaid)
1 Hour pass for Rm2 – capped at 100MB*
1 Day pass for Rm8 – capped at 500 MB*
*Standard data charges apply for usages above capped volume.

MONTHLY PASSES
For Postpaid: RM58 for 500MB, RM78 for 1.5GB and RM88 for 3GB
Subsequent charges of 0.5 sen/kB for usages above capped volume.
For Prepaid: RM68 for 500MB, RM88 for 1.5GB and RM98 for 3GB

For more info