I haven't enough rep. The windows-phone-8 tag exists but 8.1 not.
I'm willing to add the tag but first I wouldn't mind knowing whether your question is relating to interfacing Windows Phone with a computer or if it is solely to do with mobile phones.
Per the help centre mobile phones are off topic
it is not about:
- electronic devices, media players, cell phones or smart phones, except insofar as they interface with your computer
If you are asking specifically about Windows Phone use and problems then you will get better support at the Windows Phone site.