An eSIM (embedded SIM) is a digital SIM built into your phone. It lets you activate a cellular plan without needing a physical SIM card. You can add travel data to your phone instantly via a QR code.

Can I use an eSIM and a physical SIM at the same time?

Yes! Most modern smartphones support dual SIM — your physical SIM handles calls and texts on your home number, while the eSIM provides affordable local data abroad.

What happens when my data runs out?

You’ll receive a notification when your data is running low. You can top up your plan directly through Sīrū at any time, or purchase a new plan for your destination.

Can I reuse my eSIM on a different trip?

eSIM plans are tied to a specific destination and duration. For a new trip, simply purchase a new plan and scan the new QR code. The old eSIM can be removed from your device.

What if my eSIM doesn’t activate?

First, make sure you’re connected to Wi-Fi during setup. If activation fails, try restarting your device. You can also enter the activation code manually instead of scanning the QR code. Contact our support team if the issue persists.

Do I need to unlock my phone?

Your phone must be carrier-unlocked to use an eSIM from Sīrū. If you purchased your phone outright, it’s likely already unlocked. Contact your carrier if you’re unsure.

How Sīrū Works

Get connected anywhere in 3 simple steps

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Japan

Get connected anywhere in 3 simple steps

Choose Your Destination

Browse 186 countries and regions. Search by destination or explore our coverage map to find the perfect eSIM for your trip.

Pick the Right Plan

Compare data packages by size, duration, and price. All plans include transparent pricing with no hidden fees or surprise charges.

Activate Instantly

Scan the QR code we email you and get online in under 2 minutes. No physical SIM swap needed — your eSIM works alongside your existing SIM.

Is My Device Compatible?

Most smartphones released in 2019 or later support eSIM technology.

Check your device manually

Step-by-Step Setup Guide

1
Open eSIM Settings
Go to Settings → Cellular → Add eSIM (or Add Cellular Plan on older iOS versions).
2
Scan Your QR Code
Select ‘Use QR Code’ and scan the QR code from your confirmation email.
3
Label Your Line
Give your new eSIM a label like ‘Travel Data’ so you can easily identify it.
4
Set as Data Line
When prompted, set the eSIM as your data line for travel. Your primary number stays active for calls and texts.
5
You’re Connected!
Your eSIM is now active. You’ll see signal bars appear within seconds.

Having trouble?

Frequently Asked Questions

See all FAQs

Ready to stay connected?

You’ve seen how easy it is — find your plan in seconds.

Browse Destinations

How Sīrū Works

Get connected anywhere in 3 simple steps

Choose Your Destination

Pick the Right Plan

Activate Instantly

Is My Device Compatible?

Step-by-Step Setup Guide

Open eSIM Settings

Scan Your QR Code

Label Your Line

Set as Data Line

You’re Connected!

Having trouble?

Frequently Asked Questions

Ready to stay connected?

How Sīrū Works

Get connected anywhere in 3 simple steps

Choose Your Destination

Pick the Right Plan

Activate Instantly

Is My Device Compatible?

Step-by-Step Setup Guide

Open eSIM Settings

Scan Your QR Code

Label Your Line

Set as Data Line

You’re Connected!

Having trouble?

Frequently Asked Questions

Ready to stay connected?