In the Android version of iGap, you are able to catch your friends’ attention and ask them to join this app even though they will be your friends then and enjoy joining to use all features.
For making use of this feature, tap the icon f three lines at the top left corner of the main page to see menu.
Now choose “Invite Friends” and see all installed applications by which you can send request to your friends.
Here for example Messaging is the selective app send the invitation. You have this right to complete this action using other apps except for messaging.