How to access the SIM card applications and services on iPhone
A SIM card is a tiny chip found inside most cell phones, but most of you are probably aware of this. We're also guessing that you know how it can be used to store contact information and a small number of text messages.
Yet did you know that a tiny amount of memory on the SIM card allows for program code to be stored there? Basic applications are usually pre-written on this program space by the carrier issuing the SIM Card. This allows users to perform operations related to their wireless service – to check their balance, to enable service features, stuff like that.
Now, accessing the SIM card applications is an easy task if you have an Android device – an icon depicting a SIM card appears in the app drawer, and the user just needs to tap it. But on an iPhone, these apps are accessible in a different way.
Step #1: go to your Settings menu and from there you pick "Mobile Data".
Step #2: Choose "SIM Applications"
Step #3: Your SIM card's applications menu should look a bit like this
And that's pretty much it! Do keep in mind that the SIM card menu on your particular phone may look different from what we have shown in the screenshot above. The features available there depend greatly on what your carrier has loaded on the SIM card. Our SIM card, for example, provides billing and payments information, as well as options to view calls we've missed while the phone has been out of service.