Hello Retzbach123
This is a common issue people with upc network encounter. There is a fix to this problem. I will list the steps:
for Android use this: in the list of “Apps” - look after a symbol that looks like a simcard. open this “app” -> choose -> Manual -> International. -> after these steps it should start to search for a network in your area, for example “TIM” Italy where you say you are.
for Apple Device use this: Settings -> Phone Symbol -> Sim-applications -> Roaming services -> choose mode ->switch from “Auto” to “Manual” -> Choose International.
have a nice holiday
Upitschi