I was called for two interviews in two different engineering teams (Radio planning and Network planning). In the end I could choose and the whole process was very friendly. The interviews were oriented towards the "Tell me why you want to work here" or "Why Telefónica/why now" kind of questions. Nothing tricky.

it was a Panel interview, then a exam of networking concepts also of project management skills, multiple interviewers one from tech and other from people operations, it was difficult, I answered all first so other candidate's responses were like pretty similar to mine, better to go first.