Don't worry about downloading apps -- your iPhone already has several tools to block all those annoying calls and texts from random numbers.

The simplest option on iPhone is to manually block individual numbers. However, spammers use a range of phone numbers, and ...

Once you block a number on an iPhone, it automatically prevents that contact from sending texts, making calls, or initiating FaceTime.

Finally, You Can Automatically Block Spam Calls on Your iPhone For a price, you can say goodbye to spam calls, even without even hitting the decline button.