Asus is reportedly interested in making Windows Phones, with the company in talks to get a Windows Phone license from Microsoft From Neowin:

In an interview with Benson Lin, corporate VP of mobile communication products at Asus, it was revealed that the company is "interested in making Windows Phones", although currently there is no timeline for a release or even a solid confirmation that it will happen. Asus is reportedly in talks currently with Microsoft to get a Windows Phone licensing deal, potentially expanding Asus' mobile products range outside that of Android and Windows RT/8 tablets.

 Asus considering making Windows Phones