There is a forum for the Android version of VV4, and it's better to post there in the future when your question is about the Android version.

The free Android version of VV4 has two differences from the full version:

• The tribe size is limited to 9 villagers in the free version.
• There is, unfortunately, a crash that occurs when you reach the maximum population in the free version (that doesn't happen in the full version). We have been unable to fix that crash. You can read more about it, along with a way to avoid the crash, here.