SIM Toolkit provides tools for managing contacts on a SIM card and viewing related card and device information. Its contact controls include viewing and modifying stored entries, importing and exporting contacts, and adding or deleting phone numbers on the SIM.

Manage contacts stored on the SIM

The app lets users view and modify SIM contacts, including their names and phone numbers. Contacts can be imported or exported from different sources, and phone numbers can be added to or deleted from the SIM card. Messaging and calling features are also described as available through the same interface.

Review SIM and service details

SIM Toolkit displays information such as the card’s country, network operator, serial number, and subscriber ID. It also shows voicemail settings, including the voicemail name and number, and can provide active roaming status and other SIM-related information. The description also identifies interactive SIM services such as balance inquiries, account top-ups, and promotional offers; which services are available may depend on the SIM.

Device and battery information

Alongside SIM details, the app can show the device manufacturer, model, version, and build ID. Its listed battery information includes status, temperature, and charging details. These are information displays rather than contact-management controls.

System app considerations

The source describes SIM Toolkit as a system app for managing SIM services and advises checking that a compatible version is installed if those services fail, since system updates may cause problems. It recommends avoiding changes or removal when SIM services are working normally.