The long-awaited Skype app, which was unveiled at this year's MWC as beta, has an issue that will affect any user that wishes to run it in the background hoping that incoming calls would alert for user input. The Verge took a dive into the beta app only to find out that should the app not be active on a Windows Phone, any incoming calls are diverted to a voicemail service.
Skype has informed The Verge that this is a limitation due to the OS itself with how notifications are too slow, stating that it takes too long to process information, open the app, and set up the call to make it practical. Unfortunately it would appear as though the team doesn't have native access and we don't expect this to be something that'll be fixed by the gold build release.
Of course we're all still awaiting integration with the OS itself, which would render the app somewhat redundant. Hopefully native access will be provided for said integration that would allow the team to have the service run in the background. Skype integrated into Windows Phone will add to the selling points for the platform thus Microsoft will need to have an efficient solution for those who use the service.
Another kink in the system is video calling, which is only in landscape mode. What's more strange is should you swipe to the text conversation mid-call the app will then switch the portrait. This is actually something Skype made the decision on and is looking to fix.
Source: The Verge