How does the iPhone block spam and ads

First open [Settings], then select [Privacy], click to enter the privacy interface

Then pull down the low-end click [advertisement], enter the advertising interface

Then check "Limit AD tracking" to block ads

Then go back to the Settings screen and click []

Then find [Call Resistance and identification] and click to enter the blacklist

Then click on the top of the edit, then click on the bottom of the block, and finally will be pulled into the blacklist of garbage and information to join it