Activate Screen: Used for activation of your account.
Check SMS Balance: You can check your mundu sms account balance.
Drafts Screen: Your messages are saved here,so that you can use them later.
Main Screen: The screen which shows up on start up.
Send To Screen: You can send SMS to your friends from your phonebook.
Sent SMS Screen: This shows all recent messages sent by you.
Sent SMS Screen with search: You can search from your last sent messages.