> ## Documentation Index
> Fetch the complete documentation index at: https://help.simsimglobal.com/llms.txt
> Use this file to discover all available pages before exploring further.

# SimSIM Help Center

> Learn how to buy, install, and manage a SimSIM eSIM while you travel.

SimSIM gives you mobile data through a digital eSIM. Choose a plan for your destination, install the eSIM on your phone, and use it as your travel data line.

## What you can do

* Browse country and regional plans.
* Check whether your device supports eSIM.
* Install a purchased eSIM from the app.
* Monitor data and validity.
* Add data when your plan supports top-ups.
* Get help with account, payment, and connection issues.

SimSIM is data-only. Keep your regular SIM active for your phone number, calls, and SMS, and use SimSIM for mobile data.

## Start with a guide

* [How SimSIM works](/en/how-it-works)
* [Check device compatibility](/en/device-compatibility)
* [Buy a plan](/en/buying-a-plan)
* [Install your eSIM](/en/activating-your-esim)
* [Troubleshoot a connection](/en/troubleshooting)


## Related topics

- [Troubleshoot SimSIM](/en/troubleshooting.md)
- [Frequently asked questions](/en/faq.md)