in fact that service considered ok compare to digi, only the bill got a lot questions to ask, but we can answer well and experience in it 

can try my service for the porting, got special discount o 

speedwise not bad, coverage wise location dependent.

nope, I'm using UMI28 myself. I get 1-5mbps depending on the location.

I just changed from postpaid to prepaid, but until now its still in emergency call.. how??

better run a test run first at your area to see if it goes well for your place 

just test it with a prepaid card first, it's cheap.  after test and your area is good then sign up postpaid, this is what i've done with my wife's umobile line.  in Ipoh area, umobile trumps maxis celcom and digi