Hi LaskarCinta, thanks for the tip. I did try that previously and just had just tried it again. It still gives me the same result. Below is the new setting I just applied:

APN: unet
Username: maxis
Password: wap

Thanks again!

mmm...that's weird. myb u wanna try dial *133# again to make sure your 3G is activated.

another question here, do u use an unlocked iPhone or using a locked iPhone with *SIM solution? (turboSIM equivalent, rebelSIM, *SIM, etc etc). because most of the time people that use this kind of solution to enable them used a locked iPhone can't get data.

Hi Cola, I've been using the 3G internet plan for more than a year. I was trying to do everything I could to make it work with iphone.
Dear WaCKy-Angel,  thank you!

Dear twinkles, i'm paying RM 99 per month.
Dear everyone,
I'm finally able to get my iPhone connected to Maxis 3G internet. To be honest with you, I didn't do much here. I repeated all my steps again from the beginning. Apparently it has something to do with the COVERAGE at my area. My guess the iphone doesn't work like my Nokia N95 8gb. I can connect to the internet easily with the n95 whereas it took iphone awhile to figure out. 50% of the time I won't be able to get online at all. This is kinda strange to me.

But anyhow, I will test my iphone 3g at some other area like KL, PJ or Subang later tonight. Hopefully the experience will be better than my area. I'll keep you guys posted.

Once again, thanks everyone for sharing your experience and advice with me. You guys are really helpful!