I'm riding on 2 different network (Maxis and Digi) and soon will get my Celcom line.
Through my experience,
Digi, many complain that Digi have the poorest coverage among the 3, but more than sufficient for KL coverage. Price is very competitive. Bill statement is clear.
No 3G (but not Digi fault), but EDGE is good for data pulling.
Maxis, many claim that Maxis have better coverage then Digi, but maybe I'm the unlucky 1, usually I get a lot of miss call sms from Maxis (but my phone didn't ring at all).
I also experience difficulty to get service inside some popular KL commercial office.
Billing is kind of funny, you can call to check your balance, but it will shoot high when it reach month end. (I'm having RM75 fix plan)
3G coverage is disappointing.
Celcom, never deal with them, but heard that coverage is the best
, but some warn me that billing is suck in the past, lately improve a lot, no more "pangilan Hantu" that shoot your billing rocket high.
just my sharing