Go to Settings > Wireless & networks > More… > Mobile networks > Access point names
Press the Menu > New APN
Enter name: Dialog
APN: dialogbb
Proxy: not set
Port: not set
Username: not set
Password: not set
Server: not set
MMSC: http://mms.dialog.lk:3130/mmsc
MMS Proxy: not set
MMS Port: 8080
MCC: 413
MNC: 02
Authentication type: None
APN type: not set