There are different ways to make a call. You can make your free calls by calling anyone in your online MO-Call friends. Just click the green call button in the chat window or right click their name in the contact list and select "Make a call". If they are not online, you will call the registered mobile number of their MO-Call account.
You can also make landline and mobile calls to contacts in your phonebook. Right click the contact in the phonebook and select "Make a call".
You can also type in a number directly using the keypad and clicking the green call button.

You can view all your call records by selecting Account > My call records. You can also select and call recently dialed numbers from the drop down list next to the number dialer.

Yes. MO-Call PC contains a phonebook to store all your contacts and their details.

If you travel using a laptop with MO-Call PC installed on it and can find a working Wi-Fi connection, you can avoid Roaming costs by using MO-Call PC instead of your Roaming mobile.

Click the "Top-Up" link next to your balance to go to the Top-Up page.