A frozen phone can indicate two different problems with a common cause: your SIM card. First scenario? You have typed an incorrect authentication code three times in a row, and your screen now only displays a short sentence: “blocked pin”, or “PUK code”. A much more common accident than you think! Have you slipped on a number without paying attention to it, three times in a row? As a result, your SIM card considers you an intruder and is immediately locked. The second scenario relates to the origin of your mobile. When you buy a phone, it is configured to be used only with SIM cards from the same operator: the one that provides it to you. It is “simlocked”, or blocked.