STEP 1 : Connect you PC / Phone to WIFI of the modem / router you want to do setting on it.
STEP 2: Open web browser. key in 192.168.8.1 , you will direct to setting page
STEP 3: Go to Setting > Profile Management , create new profile and key in correct apn name as per info given below , after done , set as default > Save and apply
Profile name can be any name
It is standard all dial no is *100#
Celcom
APN: celcom3g or celcom
Digi
APN: diginet
Maxis
APN: maxisbb or bbnet
umobile
APN: my3g
Yes4G
APN: yesnet
XOX
APN: xox
unifi
APN: unifi
webe
APN: webe
TuneTalk
APN: tunetalk
Redone
APN: celcom3g
Tron
APN: mobiledata
Happy
APN: 3gdgnet