For those who don’t know, the Broadcom WiFi that comes with Dell XPS 13 is not supported by most current Linux distributions (kernel version < 4.4).
After a 2 months of using a USB ethernet adapter to connect to internet on my XPS 13 2015 I have recently received my replacement wireless adapter. I’ve bought an Intel 7265 Dual Band Wireless-AC from Amazon as suggested by multiple sources on the web. It took 2 weeks to arrive.
Opening the back panel was very easy. The whole process of replacing the adapter took less than 10 minutes.
The adapter worked as soon as I booted both into Windows 10 into and Fedora 23. Now I can actually use this laptop in the way it was supposed to be used, without any cables hanging from it.