I'm currently subscribe to 3 networks: Celcom, Webe and digi.
I have to say, maxis still the best. Just to name a few example, eg. they provide free oversea calling service to maxis. all three other telco don't. maxis customer service is much more professional compare to the rest of the three as well. digi keeps you on the line for a good 5 minutes and above. Webe don't even have a service line provided to customer. Celcom's staff are not well train, information give is not consistent.