Telefonica Spain APN Settings for Microsoft Surface 3

Press Start button and then open the menu using the button on left top.
Select Settings, Network & Internet and then Cellular
Click on your network name on right hand side.
Click Advanced options
Click Add an Internet APN and enter information as below.

Profile name: Telefonica
APN: movistar.es
User name:
Password: MOVISTAR
Type of sign-in-info:
IP type: IPv4

Check Apply this profile and press Save.