Backup data for when your main network drops out
Sidekick is a data-only eSIM that sits alongside your current SIM. When your main network drops out, your phone switches data to Sidekick on one of the other UK networks. Your allowance also works across the EU, EEA and Switzerland at no extra cost. Every plan starts with a 30-day free trial.
Sidekick doesn't replace anything. It sits alongside the SIM you already have and steps in when your main network can't.
Stays in charge
Main signal drops?
Your phone switches data to Sidekick
Backup data
Where no UK network has signal, no SIM can connect. Sidekick helps wherever any of the four networks has signal, not where none do.
Eight everyday moments when a second network helps.
Laptop open, report due, and somewhere past the cutting your signal gets off the train.
Emails, calendars and your commute playlist keep going.
One bar of signal, and only if you stand on the bench by the post box.
Messages, maps and the village group chat keep going.
Ninety-eight drops, and the delivery app stops loading halfway down a country lane.
Routes, delivery apps, quotes and invoices keep going.
Farm park. Three children. One lost welly. And a group chat that won't send.
Messages, photos and meeting-point pins keep going.
A café, a spare room, and a video call that freezes on your least flattering face.
Video calls, emails and shared documents keep going on your phone.
Six miles in, a fork in the path, and the map on your phone has gone blank.
Maps and messages keep going wherever one of the four networks reaches. Pack a paper map too.
Library basement, deadline at midnight, and the only thing loading is your stress levels.
Group chats, uploads and online lectures keep going.
Monday in Manchester, Wednesday in Madrid.
Your allowance also works across the EU, EEA and Switzerland at no extra cost, for occasional trips.
Use your Sidekick allowance in every EU and EEA country and in Switzerland, at no extra cost. Abroad, Sidekick connects to our partner networks there, so your backup line keeps working on holidays and business trips.
Sidekick is a UK product with roaming included for periodic travel, not for permanent use abroad. See our Fair Use Policy for details.
Included countries
Once your subscription starts, we email you when your Sidekick eSIM is ready to install. It also appears under eSIMs in your account.
Pick your data, tell us which network your main phone is on, and start with a 30-day free trial.
Install the eSIM from your email, then turn on data roaming for the Sidekick line. It won't connect without it, even at home.
Leave the Sidekick line switched on, keep your main SIM as your default line, and let your phone switch data to Sidekick when your main signal drops.
Menu names vary by phone and software version. On older iPhones, Mobile Service is called Mobile Data.
Why roaming? Sidekick connects to UK networks as a roaming partner, so your phone treats it as roaming even at home. You won't pay extra roaming charges: everything comes out of your Sidekick allowance. Only the Sidekick line needs roaming on.
When your Sidekick eSIM first connects, we text the Sidekick line to confirm it's live.
Not connecting? First check that data roaming is on for the Sidekick line: that solves most problems. Then toggle flight mode on and off, or restart your phone.
At checkout we ask which network your main phone is on: EE, O2, Vodafone or Three. Sidekick then avoids that network, so it can keep you online when your main network fails.
Not with one of the four? Many providers run on one of them. Choose your provider from the list at checkout and we'll show which network it runs on.
Pay monthly, or save with a 12-month plan. Every plan starts with a 30-day free trial.
Every Sidekick plan, monthly or 12-month, starts with 30 days free for new subscribers.
First-time Sidekick subscribers. If you've had a Sidekick subscription before, even on an account you've since deleted, a new one starts without a trial.
We ask for a card when you sign up, but don't charge it during the trial.
We email you 3 days before the trial ends. After that, your subscription continues and your first payment is taken.
Cancel before the trial ends and you won't be charged. Cancelling ends the trial and switches off your Sidekick eSIM straight away.
More answers in the Help Centre.
Start with a 30-day free trial. Cancel before it ends and you won't be charged.
