does blue cube accept buying the phone outright?

Nope, only if for smartphone rebate package, you can buy with celcom prepaid.

Just buy 1 celcom prepaid RM 8.50 + top up RM 30, then you can buy iPhone 5 with RM 2,199 - RM 200 rebate.

So total cost RM 2,037.50

This is what I've been told by Celcom branch staff when I signed up for my postpaid iPhone 5 plan, cause I asked whether can buy another set outright, he told me only offer for smartphone rebate package, otherwise not possible.

I see.

From this story I saw Celcom has no systematic...
Anyway, do you encounter connection problem including 3G load slow or not load at all although on 3G networks ?

I in Kelantan here suffered a lot, I called customer support, they told me Thailand telco tower frequency disturbed here Kelantan area... WTS... Why not Perlis, Kedah and Perak also get disturbed...