> For the complete documentation index, see [llms.txt](https://docs.roamfi.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.roamfi.net/product-elements/q-and-a.md).

# Q\&A

> **How do I set up and use eSIM?**

While connected to Wi-Fi and with Airplane Mode turned off, open the RoamFi app.\
From the bottom menu, select **“eSIM”**, and follow the instructions to install and activate your eSIM by scanning the QR code or manually entering the activation code.

Then, in your device settings:

* Go to *Cellular/Mobile Networks → RoamFi eSIM* and enable **“Data Roaming”.**
* Go to *Cellular/Mobile Data* and enable **“Allow Data Switching”.**

When you arrive at your destination, your RoamFi eSIM will automatically activate.\
You can also manually select RoamFi eSIM as your data source via device settings.

> **Does RoamFi eSIM support calls or SMS? How can I check the number?**

At this moment, RoamFi eSIM provides **data-only service** and does not include voice or SMS.\
Some eSIMs (e.g., Philippines SMART, U.S. T-Mobile, Guam IT\&E, Vietnam Vietnamobile) may include a number, which will automatically appear or can be checked via dialing codes.

> **Can one eSIM be used on multiple devices or transferred?**

No. Each eSIM can only be used **once** and on **one device**.\
Once installed, it cannot be transferred. To use on another device, a new eSIM is required.

> **When should I add my eSIM? How long is it valid?**

Some eSIMs start counting their validity period immediately upon installation.\
It’s recommended to add your eSIM **on the day of departure**.

Most eSIMs must be activated **within 30 days of issuance**.\
If your planned usage is more than 30 days away, register closer to your travel date.\
Expired eSIMs cannot be reactivated. For assistance, contact RoamFi customer support with your order number.

* **FLEX mode:** One eSIM can be used permanently across multiple countries and regions after a single installation.
* **FIX mode:** Each new package requires a new eSIM installation.\
  Do not delete an active eSIM before its validity period ends — it cannot be reinstalled.\
  Each eSIM can only be used once and cannot be reinstalled on another device.

> **How can I check if my device supports eSIM?**

Dial <kbd>**\*#06#**</kbd> on your device.\
If **EID** appears, your phone supports eSIM.\
If only **MEID** or **SEID** appears, it does not.

For **iPhone:**\
Go to *Settings → General → About → SIM Lock Status*.\
If it shows “No SIM restrictions”, your device is unlocked.

For **Android:**\
Go to *Settings → About Device → SIM Status*.\
If locked, contact your carrier for unlocking.

> **What if my eSIM doesn’t connect or data isn’t showing?**

If your eSIM fails to connect or shows no data usage, check that:

* Data roaming and APN settings are correctly configured.
* Restart your device.\
  If the issue persists, please contact RoamFi customer support.