So far I have paid for UniFi via OCC UniFi. I made a mistake, should have split into three payment channels. OCC UniFi, UOBPayOnline and TM Portal.

I also paid Digi bills via MyDigi app.

Will try soon for TNB via UOBPayOnline. Already spent more than RM 600 on YOLO so far.

Part of my community service to the thread, to test which are the cash back-able merchants.

Anyone know is there any booth in shopping mall that can apply YOLO card?

ipc, no.
cheras, yes.

verified by posters under PBB VS' 6% Dining

Just minutes ago, I called UOB CS, regarding the absence of cashback for TM Streamyx Bill paid via UOB PayOnline website (with the description of "TELEKOM MALAYSIA BHD KL(HD) MY"). For sure, I did not mention about UOB PayOnline website at all.
The MCC of TELEKOM MALAYSIA BHD KL(HD) MY is 4814 (Fax Services / Telecommunication service including local and long distance calls, credit card calls, calls through use of magnetic-strip reading), consistent with  Merchant Category Code (MCC) CashBack list thread.
UOB CS said that 6% cashback is not given for TELEKOM MALAYSIA BHD KL(HD) MY, because such transaction is classified as Utilities bills. The cashback exclusion is not due to MCC.
I explained that other Yolo credit card users managed to get the 6% cashback for the same transaction last month, and it is weird that UOB stops giving cashback for that particular transaction, starting from this month. But, UOB CS could not answer my question, and instead repeatedly insisted that utilities bill is the reason that the cashback is not given, as if UOB CS wanted to end the telephone call immediately. It felt like at that point, UOB CS gave any sort of excuses just to silence me, made me to give up asking for more clarification, so that I would not question about the lack of cashback anymore. 
I guess that there is no way to salvage or reinstate the cashback for TELEKOM MALAYSIA BHD KL(HD) MY. 

anybody know about this offer?
i already register thru sms
then what? just proceed pay online?