Imo has been widely used for years now by fans of instant messaging looking to bring all their various accounts under one umbrella. The company recently announced that it is expanding its free VoIP calling service from an Android-only option to users on iOS devices as well.

The Imo app can aggregate the eleven top IM applications into one easy service. And while Android clients have enjoyed free VoIP calling on top of all of that, any Apple users running iOS 3.1 or later who also have a 3G or better wireless connection will now be able to make their own VoIP calls.

Users should take note that calls made while on your own 3G or 4G service will sap your data plan, and could be costly if you’re not too careful. Simply switching to an available Wi-Fi service will remove that concern.

According to Imo representatives, the quality of the calling service should stand up to any traditional phone. Add that to the app’s voice-based IM service, photo sharing capability, and group messaging through Google Talk, Skype, Facebook Chat and many others, and you’ve got one powerful tool on your mobile device.

The proof is in the numbers. To date, Imo has been downloaded more than four million times. And people are really using it as well. They average more than fifty million messages delivered each and every day, from over 700,000 regular users. Imo added VoIP calling to their Android app in February of this year, and it is a bit odd that it took them so long to figure it out for iOS customers. That delay may cost them some users, as there are now several other VoIP service apps for iOS devices that have already gained traction.

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