Guys, Im here in Malaysia for 3months and would like to subscribe umobile prepaid for my iphone..im thinking of just taking the u18 prepaid plan...however, what I don't understand is it says that 250mb is allocated for fast-internet, then after that the speed will be throttled..so my questions are :

1) how fast of 'fast internet' are we talking about?
2) what will the speed be after the 250mb is finished?
3) no extra charge after the 250mb is finished right?