Wish you could put that Windows app purchase on your phone bill rather than rack up a separate charge? Microsoft just made your day. It's bringing carrier billing to all Windows devices, so you only have to make one payment to cover everything. There are 90 providers involved, too, so there's a very good chance that your network of choice is eligible. The move is welcome, if not totally surprising. When Windows 10 focuses heavily on universal apps that run on both phones and PCs, it only makes sense to pay through your carrier on whichever hardware you use.