MAXIS

1) Home -> Menu -> Settings -> Wireless & networks -> Mobile networks -> Access Points Name
2) Menu -> New APN
Name = Maxis(3G)
APN = unet
Username = maxis
MMSC = http://172.16.74.100:10021/mmsc
MMS proxy = 202.75.133.49
MMS port = 80
APN type = default,mms
(Others, leave blank)

DIGI

1) Home -> Menu -> Settings -> Wireless & networks -> Mobile networks -> Access Points Name
2) Menu -> New APN
Name : DiGi Internet
User name : digi
APN: diginet
MCC: 502
MNC: 16
APN Type: default
(Others, blank)

NOTE : If you subscribed to Digi Internet Prepaid package ( RM2/day package ): the APN is : 3gdgnet

DIGI MMS

APN: digimms
username: mms
password: mms
Proxy: 203.092.128.160
Port: 80
MMSC: http://mms.digi.com.my/servlets/mms
MMS Proxy: 203.092.128.160
MMS Port: 80
MCC: 502
MNC: 16
APN Type: mms
CELCOM

1) Home -> Menu -> Settings -> Wireless & networks -> Mobile networks -> Access Points Name
2) Menu -> New APN
Name : Celcom 3G
APN : celcom3g
MMSC: http://mms.celcom.net.my
MMS Proxy : 10.128.1.242
MMS Port : 8080

Other settings you can try :

Celcom 3g internet setting :

Name : Celcom 3G Internet
APN : celcom3g
MCC : 502
MNC : 19
APN type : default

Celcom 3g MMS setting :

Name : Celcom 3G MMS
APN : celcom3g
MMSC : http://mms.celcom.net.my
MMS proxy : 10.128.1.242
MMS port : 8080
MCC : 502
MNC : 19
APN type : mms

Celcom 2g internet setting :

Name : Celcom 2G Internet
APN : celcom.net.my
MCC : 502
MNC : 19
APN type : default

Celcom 2g MMS setting :

Name : Celcom 2G MMS
APN : mms.celcom.net.my
MMSC : http://mms.celcom.net.my
MMS proxy : 10.128.1.242
MMS port : 8080
MCC : 502
MNC : 19
APN type : mms