Sometimes you add a contact to your Lumia Phone that you want to delete later on. 
If you don’t know how to remove a contact on your Lumia Phone this article will help you to
delete a contact from your phone. I will also tell you in this article why you can’t delete some of the contacts in your contact list.


How to remove a contact on your Lumia Phone
If you want to remove a person in your contact list you have to go to the Persons app
in your Lumia Phone. Tap the contact and press delete.

It’s not always possible  to remove a contact. If your contact is synchronized with your Facebook or Skype account you can not delete the contact from your contact list by just deleting it from your contact list.
The delete option will be grey and you can not delete the contact just by tapping the contact and by pressing delete.
You will have to unsync your contact  with Skype and / or Facebook. After you have unsynced the contact you are able to delete the contact from the Person app

Unsync With Skype 
If you enabled Skype to synchronize with the people app the contacts in your Skype application and the person app are
synchronized. If you disable the option to Synchronize with Skype your contacts will not be synchronised anymore.


Unsync with Facebook 
Click on the Facebook icon on your Lumia phone. Click on Settings. Tap on Connect to my Phone.
Turn Off "Connect to My Phone". By Default its On.