Having to enter a PIN code every time you have to use your phone while it is a security measure that protects you, you can become a nuisance. If you decide to remove this block, you must go to Settings on your iPhone to do so.
Once inside this section that you have access to numerous configurations, you must scroll down until you find the word in the list Phone and its corresponding icon.
Then, to remove the PIN iPhone, what you have to do is scroll back down to find where it says SIM PIN. We emphasize that this is not the phone lock code nor the Touch ID, these are security measures that Apple offers for the device and do not depend on the company you have hired telephone services.
Once inside, you see that is marked in green, meaning you actually have activated the PIN. To make your iPhone do not re-order number, click on the green button.
Then, you see a screen like the one you see in the picture, in which you must enter the PIN appears. Beware wrong, because if you enter the wrong code so the phone would be blocked 3 times in a row. The PIN usually occurs on the board in the coming inserted your SIM card.
Once you have entered your code on the previous screen, the iPhone you will no longer ask for the PIN each time you go to use it.