hey guys , i got some simple question need u guys to clarify for me

1. im currently subscribe the Iphone Idata Plan (iData 3) which is 3GB local data included. this plan is unlimited ?
2. im currently at kampar (perak) area study , my speed at this area is really slow like hell , izzit consider area problem ? or other problem ?
3. can i make a complaint about the speed that i suffer now ?

thanks a lot ...