All,
After review all the comments, guess that was some mistake or wrong impression occurs.
I have been using Maxis 3G unlimited package for pass 3 years due to job requirement. Here my experience.
3G Unlimited package include of any 3G / EDGE or GPRS traffic. As some area may not cover by 3G hence it will drop to EDGE or GPRS and you still enjoy unlimited data follow but slow.
If your phone only EDGE, this package applied too.
Initial Billing. Once you indicated you want the unlimited package, then billing will start and it will be average break down till your billing day.
Example: Your billing date is 15th each month, and you initial on 8th. The bill will average the 7 days and charge to your bill.
• Take note. You need ensure it was already cover by the unlimited package before start use. Yes, reconfirmed it. Initial I hit the problem when the CS informed it been activate and I start using it. Just for few days, the cost was RM200 over...but it been resolved by they re-adjust the bill.
Whether you turn off 3G and switch to EDGE, but as long you initial the data connection, maxis will charge too. Hence you have only 2 options. Turn off any data traffic or pay...

Different between 3G / EDGE / GPRS is the traffic speed. Costing still remain the same, as they calculate base on data usage not speed.
• My statement stand only if you are Post Pay customer not prepay.