The following review written by one of the Software Informer contributors applies to version 4.0
Chikka Messenger is the first two-way PC-to-mobile instant messaging client.
Chikka can be used to send free text messages directly from PC to mobile phones all around the world.
Instant and uninterrupted connectivity with your buddies allow you to chat with them as easily as it would be with an Instant Messaging Buddy.
This New version of Chikka also provides a way to connect to Google Talk! You can add your Google Talk contacts to your buddy list and chat away, even if you're offline. Even if you are not on your Computer system, that shouldn't restrain you from being aware of your friends, as the Chikka client can automatically forward messages to your mobile phone when you leave your PC.
Furthermore, you can also send images, including Pictures and Photographs to your friends, online or on their mobile. You can also activate the tab for your friends by which you can get alerts on your mobile phone whenever your buddy comes online. Chikka Messenger supports up to 320-character SMS. Using Chikka you can also send sms to multiple recipients or a group at once. An added wonderful feature of Chikka is that if you have a Paypal account, then you can use Chikka to send load/top-up credits to your friend's mobile phone. It’s easy and secure.