Users of Skype for the iPhone can now receive background Skype calls while using iOS 4 on the iPhone 4 and 3GS. A notification will pop up, which you can then answer while continuing to use other apps. Best of all, they won’t be charging for using the feature over 3G. The new Skype Background VoIP for iPhone is a premier app for Apple’s 4th generation iPhone, and will be an even bigger selling app for the upcoming next-gen iTouch, assuming it’s compatible. Supposedly, the new iTouch will house a mic, which is an obvious sign that WiFi calling will be a ground-breaking option. You can download the new Skype Background VoIP app from the App Store right now. What is an esim?