What is IMSI?

**What is IMSI?**

An international mobile subscriber identity ( IMSI) is a unique identifier mobile networks use to recognize a subscriber. In the case of Surfroam, IMSI refers to different mobile network profiles stored within a Surfroam eSIM or SIM.

**How Surfroam Uses IMSI**

Surfroam is designed for frequent travelers and includes a multi-layered backup system to ensure connectivity in every covered country.

Surfroam eSIM carries multiple IMSI profiles: IMSI 2, IMSI 7, IMSI 10, IMSI 22, IMSI 25, and IMSI 26.
Surfroam SIM includes IMSI 2, IMSI 10, IMSI 22, and IMSI 23.

**How IMSI Works in Different Countries**

The eSIM automatically selects the best IMSI in each country and applies the correct APN settings.
If needed, you can manually switch the IMSI for better connectivity.

Example:
In Portugal, Surfroam provides coverage via IMSI 7, IMSI 22, IMSI 23, and IMSI 25. If one IMSI does not work, you can switch to another for a stable connection.

**Best Device for Surfroam**

From our experience, iPhones with eSIM offer the best performance as they:
✔ Automatically switch between IMSIs in most countries.
✔ Provide easy manual management if needed.

To ensure a seamless travel experience, it’s essential to understand how to switch IMSI profiles and set the APN manually when necessary.

Updated on: 28/02/2025