Telefonica Spain APN Settings for Microsoft Lumia 550

Go to App list, tap Settings Network & Wireless Cellular & SIM

In Cellular, select your SIM card
Select Properties
Under Internet APN select Add an Internet APN

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

Enable Use this APN for LTE and replace the one from my mobile operator

Proxy server (URL):
Proxy port:

Tap Save