# How to Understand the Settings on your SIM Inside of your physical SIM or eSIM profile, there are various small applications and files that influence how your device connects to the cellular networks. There are the standard elementary files (EFs) found on all SIMs that you can read or written to via common AT Commands. There are also resources specific to Super SIM,such as our [multi-IMSI applet](/supersim/supersim-multi-imsi-applet.md). Each of these may impact how a SIM behaves. We'll refer to this collection of files and applications on the SIM as the SIM's "settings". From time to time, SIMs will be manufactured with updated settings in order to: * give you access to more networks or new radio technologies * route data through different downstream connectivity partners to deliver an improved experience or reduced rates that we can pass onto you * fix configuration issues on the SIM ## Updating Existing SIMs Over-the-Air Existing SIMs will be updated over-the-air (OTA) to deliver a consistent experience across your SIMs regardless of when they were originally manufactured. Your SIM will automatically open a separate data connection to check for and download updates. Learn more about [over-the-air updates.](/supersim/over-the-air-updates.md) ## Settings Packages A SIM will have one or more Settings Packages installed on it at any given time. All SIMs will have a version of `base-settings` installed on them. Additional Settings Packages may be applied in addition to the `base-settings` to deliver different customized experiences by overriding some portion of the configuration in the `base-settings`. Each Settings Package has a version and generally follow [semantic versioning](https://semver.org/). When changes are made to a Settings Package, a new version is released. Each Settings Package may have dedicated documentation explaining how the experience may have changed from version to version. For example, see the [documentation](/supersim/how-to/sim-settings/base-settings-package.md) for the `base-settings` Settings Package. ## Viewing a SIM's Settings and Updates You can use the [SettingsUpdates](/api/products/supersim/settingsupdates-resource.md) API to determine what Settings Packages are [currently installed](https://docs.korewireless.com/en-us/api/products/supersim/settingsupdates-resource#determine-a-sims-current-settings) on a SIM and if there are any outstanding over-the-air (OTA) updates waiting for your SIMs. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.korewireless.com/supersim/how-to/sim-settings.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.