WHO ARE WE
Nesslock is a software company.
Our software sells and delivers your travel eSIM.
LESS COST
Our system runs itself, so we don’t need big teams or heavy overheads. That keeps your price low and your setup simple.
LESS WORK
Pick how long you’re away and how much data you need. Tell us the country. That’s it — we handle the rest.
MORE THAN ONE STOP?
One regional pack covers the whole trip. Cross borders without swapping eSIMs or installing anything new.
MEMBERS APP
Check your data, top up, and buy your next eSIM in seconds. Everything in one place, always with you.
Select Your Package
Support
New to eSIM? Start here. Everything you need to get set up, stay online, and top up when you need more data.
How do I know if my phone is eSIM‑compatible?
Most recent iPhones and many Android phones support eSIM.
Quick check on iPhone
- Open Settings.
- Tap Cellular (or Mobile Service).
- If you see Add eSIM or Add Mobile Plan, your iPhone is eSIM‑compatible.
Quick check on Android
- Open Settings.
- Tap Connections (or Network & Internet).
- Tap SIM manager.
- If you see Add eSIM, your phone is eSIM‑compatible.
You can also dial *#06# on your phone. If you see an EID number on the screen, your device supports eSIM.
How do I check if my phone is unlocked from my UK network?
Your phone must be unlocked to use a travel eSIM alongside your UK SIM.
On iPhone
- Open Settings.
- Tap General.
- Tap About.
- Scroll to Network provider lock.
- No SIM restrictions = your iPhone is unlocked.
- SIM locked = your iPhone is locked to a UK network and won’t work with other carriers until it’s unlocked.
On Android
- Open Settings.
- Tap Connections.
- Tap Mobile networks.
- Tap Network operators.
- Turn off Select automatically.
- If you see multiple networks, your phone is likely unlocked.
- If you see only one network or can’t turn off automatic selection, it may be locked.
If you’re not sure, contact your UK network and ask them to confirm whether your device is unlocked.
When should I buy my eSIM?
You can buy your eSIM up to 120 days in advance. We recommend you install it before you depart on your travels.
When should I install my eSIM?
Install your eSIM the day before you travel, while you still have strong Wi‑Fi at home.
What should I do before I install?
Before you install, do these three things:
- Update your phone to the latest software.
- iPhone: Settings > General > Software Update
- Android: Settings > System > System update (or similar)
- Restart your phone (power off, then on again).
- Make sure you are connected to Wi‑Fi.
This fixes most installation issues.
Will my eSIM start as soon as I buy or install it?
Install up to 120 days before you travel. Activate in your chosen Country by switching on Data Roaming.
What if the QR code won’t scan?
We have 3 different ways to install. You should very rarely need the 3rd.
If you have another device, monitor, phone, laptop etc then simply display the QR on that and scan with your device.
If not, click one of the install buttons on your welcome email.
Do I need to turn on Data Roaming?
Yes, for your travel eSIM.
Data Roaming must be ON for the eSIM line to connect to networks outside the UK. This does not affect your UK SIM’s roaming settings.
On iPhone
- Settings > Cellular (or Mobile Service).
- Tap your travel eSIM.
- Turn on Data Roaming.
On Android
- Settings > Connections > Mobile networks.
- Turn on Data roaming for your travel eSIM.
Menu names may vary slightly by phone.
Can I keep my Existing Home SIM switched on?
Without an inclusive roaming package we’d suggest turning that off. Use your Powered By Nesslock eSIM for Data and Call on WhatsApp.