What is SIM Toolkit app on Android and Can we Remove It?

Android phones come along with a bunch of pre-installed apps. Most of these are Google-made applications that may also help you get work done on a daily basis as well. Some manufacturers also install their own set of apps out of the box. However, the one app that you guys may also notice on any Android app you use will be SIM Toolkit. So what is SIM Toolkit and what can you guys do with it? That’s what we are actually here to talk about in this article. Just read this to know all about What is SIM Toolkit app on Android and Can we Remove It?

What is SIM Toolkit?

Well, as smartphones became more and more feature-rich. Then the process of setting up SIM cards (called provisioning in technical terms) also became harder throughout the day. That’s actually because provisioning a SIM on a phone needed details. Such as SMS center number, MMS server name, mailbox number, and also any other data. This data differed from one operator to the other and that’s where SIM Application Toolkit actually came into being.

SIM Toolkit or SIM Application Toolkit (STK) is just a set of commands that are available on your SIM card. Those are defining via 3GPP and ETSI specifications and can either activate via the user or because of a networking event. Essentially, they’re small applications that also come preinstalled on your SIM. That itself can also consider a mini-computer where programming is possible as well.

STK was actually developed as a means in order to run applications directly on a SIM card that’s based on a GSM network. The standard we use via mobile network operators and service providers in order to execute actions. That triggers various value-added services. These value-added services can then implement on your SIM card in order to bring a carrier’s custom UI and also menus onto different handsets.

The Toolkit app that’s also available on your phone is programmed into the SIM card via your cellular service provider. This app turns on means of interaction between the network and user, also reveals the mobile equipment interface, and gives users access to network control.


The SIM Toolkit’s operation on your phone can also be categorized into various groups that also offer different functions.

  • User Interface control: Show text, menu, play tones, choose a menu item, and also language notifications.
  • SIM control: Refresh your SIM card, check poll interval, also show polling, turn on events, get reader status, switch ON/OFF SIM card as well.
  • Network control: This permits sending short messages, USSD and DTMF info, and then setting up a call.
  • Inter-networking control: Can open the browser, send as well as receive data, open channels, and also retain channel status.
  • Other functions: Give access to timer management and also local phone info as well.

If you guys are thinking about what all these things mean, to put it simply, the SIM Toolkit also offers you an easy way. In order to activate or use your operator’s value-added services. Relying on your operator, you will offer services such as utility services (information about missed calls, International calls, air, and also rail info). Sports scores, caller tunes, also astrology, news, jokes, and also the ability in order to contact your operator’s customer care directly.

Plus, it’s believed that STK offers users improved security for digital transactions since it permits encryption and verification of your identity as well.

How the SIM Toolkit app Works

SIM Toolkit is independent of a smartphone’s make and model and it actually looks pretty much the same on all Android devices. The only thing that might be different from the SIM Toolkit app from one phone to the other is options and also menus. That is available on-screen since one network might give options different from another carrier’s value-added services as well.

Essentially, the SIM Toolkit permits your phone’s SIM to initiate and then relay commands between your phone and network.

Just think of SIM Toolkit as a client-server relation where your phone acts since the client. While the SIM card that is inserted into a phone is server-side. Just like any other app, the SIM Toolkit implements multiple layers in order to work with your phone as well as your service provider. These layers basically include:

  • RIL – Vendor side software
  • SIM ToolkitMachine code actually used to translate raw text from RIL to the application as well
  • UI – It’s actually the interface that reads the application-level messages and shows them as options and menus on your phone as well

Before modern smartphones, a mobile’s toolkit locks along with a PIN or phone lock. In order to protect its applications from misused as well. Whenever locked, you won’t be able to access the applications from within the SIM. As well as on the phone without even the SIM card.

Prior to 4G, the SIM toolkit was actually based on the GSM 11.14 standard. The current standard for SIM toolkit for LTE SIMs is 3GPP 31.111 that also incorporates USIM Application Toolkit for networks that still depend on 3G.

Can we Remove the SIM Toolkit app?

The short answer is actually no. SIM Toolkit integrates on your phone via your SIM and is actually an important utility. That permits operators to activate a new SIM card as well as enable a feature from your network to your phone directly. Because it’s an integral part of your phone, there’s also no way you can uninstall it. As well as disable the SIM Toolkit app on your Android device actually.

In our opinion, there’s actually no harm in leaving the app be on your phone. Just simply because it’s a tiny comparison to other applications on Android and doesn’t even hinder your phone’s usage.


Well, That is all from my side. If you want to know more about this article or have any queries. Then feel free to ask me anything in the comments section below.

Have a Good Day!

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