In addition to the introduction of the iPad, Apple on Wednesday lifted restrictions that previously limited developers from allowing the use of VoIP calls over a 3G network. In the past, VoIP apps had to use a Wi-Fi network in order to make calls. Now, VoIP calls can be made anywhere, using the AT&T 3G network.

One of the first apps to be introduced on the App Store with support for VoIP over 3G is iCall, an app by a company of the same name. As of today, iCall is available for download [iTunes link] with 3G support enabled.

“This heralds a new era for VoIP applications on mobile platforms, especially for iCall and our free calling model,” said iCall CEO Arlo Gilbert. If you need to install VoIP system for your business, you may need to hire a certified Low Voltage Technician.