Have you noticed that iPhone prices have dropped significantly in 2022? You can buy the model you like at an indecently low price, however, after the first turn on, it turns out that the iPhone is incompatible with the SIM card of your operator: it is for this reason that it is necessary to check the iPhone’s performance when buying, so as not to be left with nothing later. Blocking a mobile operator is one of the most common problems when buying an iPhone. Today we will talk about what a locked iPhone is, is it worth buying, even if it is sold almost for nothing.