If you are on Dialog, this is how you do it...
Settings > Wireless & networks > Mobile networks > Access Point Names...
ඊට පස්සේ Menu button එක click කරලා New APN select කරන්න .
After that type anything for "Name". It's your choice. It's not important. And for APN;
enter ppwap if you are using a prepaid connection. For postpaid connections there two APNs dialogbb and
www.dialogsl.com. Try which one worrks for your connection.
Proxy : 192.168.122.2
Port: 8080
Keep the Username & Password fields blank.
MMSC:
http://mms.dialog.lk:3130/mmsc
MMS Proxy: 192.168.122.2
MMS Port: 8080
MCC: 413
Authentication Type: none
APN type: default,supl,mms
Or else, go to this link
http://www.dialog.lk/mysettings/