How long does eSIM activation take?

Most customers are fully connected within five minutes. The QR code arrives by email within seconds of completing payment. Scanning the code and installing the eSIM profile takes under two minutes, and activation is instant. There is no waiting period, no approval process, and no need to restart your phone.

Can I keep my existing phone number?

Yes. To transfer your existing number to Fuse, text PAC to 65075 from your current provider. You will receive a porting authorisation code within a minute. Enter this code during the Fuse sign-up process and your number will transfer — usually within one working day. Your previous provider is cancelled automatically once the transfer completes.

What if my phone does not support eSIM?

If your phone does not support eSIM, you will not be able to use Fuse at this time. We are focused on eSIM technology as our digital-first approach, but we are exploring options for broader device support in the future. You can check your device compatibility on our How It Works page or in your phone settings under Mobile Data or Cellular.

Can I use Fuse alongside my current SIM?

Yes. Most modern phones support dual SIM — one physical SIM and one eSIM running simultaneously. You can keep your existing provider in the physical SIM slot for calls and texts, and use Fuse in the eSIM slot for data. This is a popular choice for customers who want to try Fuse before switching fully. You can configure which SIM handles calls, texts, and data independently in your phone settings.

What do I need to activate?

You need three things: an eSIM-compatible phone, a Wi-Fi connection for the initial setup (to download the eSIM profile), and an email address for your account. That is it. No ID verification, no credit check, no waiting. The entire process is completed online in under five minutes.

What if the QR code does not work?

First, make sure you are scanning the QR code with your phone camera, not a third-party QR code app. Ensure your phone is connected to Wi-Fi, as it needs an internet connection to download the eSIM profile. If the code still does not scan, check that eSIM is enabled in your phone settings. You can also try entering the activation details manually — instructions are included in your activation email. If you are still having trouble, contact our support team at support@fusemobile.co.uk and we will help you get connected.

How to activate your eSIM

From sign-up to connected in under five minutes. Here is everything you need to know about activating your Fuse multi-network eSIM and getting connected to all four UK networks.

Six steps to better signal

No shop visits, no SIM card in the post, no technical knowledge required. Follow these steps and you will be connected to all four UK networks in minutes.

Check your phone is compatible

Most phones released from 2018 onwards support eSIM, including iPhone XS and newer, Samsung Galaxy S20 and newer, and Google Pixel 3 and newer. Visit our compatibility checker on the How It Works page to confirm your device is supported. You can also check by going to your phone settings and looking for a Mobile Data or Cellular section — if you see an option to add an eSIM or mobile plan, your phone is ready.

Choose your plan

Pick the data allowance that works for you. All Fuse plans include access to all four UK networks — EE, Three, Vodafone, and O2 — with no contracts and no hidden fees. Whether you need 5 GB for light browsing or unlimited data for streaming and tethering, every plan comes with the same multi-network coverage and zero app restrictions. You can change your plan at any time.

Create your account

Sign up with your email address. It takes less than a minute. You will create a password and provide a few basic details. There are no credit checks, no lengthy forms, and no waiting for approval. Your account is created instantly and gives you access to your dashboard where you can manage your plan, view usage, and access support.

Complete payment

Pay securely with any major card. There is no deposit, no upfront activation fee, and no hidden charges. Your first month is billed immediately and your plan renews monthly from that date. You can cancel at any time from your account dashboard with no exit fees. All prices include VAT.

Scan your QR code

After payment, we email you a QR code within seconds. Open your phone camera, point it at the QR code, and tap the notification that appears. Your phone will guide you through installing the eSIM profile — just follow the on-screen prompts. The whole process takes under two minutes. If you need help, our step-by-step guide walks you through every screen.

You are connected

Your eSIM activates instantly after installation. Your phone will start connecting to the strongest available network — choosing between EE, Three, Vodafone, and O2 based on signal strength at your location. There is no waiting period and no manual configuration required. Open the Fuse app to see your connection status, monitor data usage, and manage your account.

Choose your plan

Switching from another provider?

Keeping your existing phone number when you switch to Fuse is straightforward. The process uses a PAC (Porting Authorisation Code), which is the industry-standard way to transfer a mobile number between providers in the UK.

Text PAC to 65075 from your current phone. You will receive a code within a minute. Give us the code during sign-up and we will transfer your number — usually within one working day. Your old provider is cancelled automatically once the transfer completes. There is no need to contact them separately.

If you would rather start fresh with a new number, simply skip the PAC step during sign-up. Your Fuse eSIM will be ready immediately with a new number, and you can cancel your old provider in your own time.

Quick reference

Text PAC to 65075

Receive your PAC code within 60 seconds

Enter the code during Fuse sign-up

Your number transfers within one working day

Activation questions

Common questions about setting up and activating your Fuse eSIM. Need more help? Visit our Help Centre or email our support team.

Ready to get started?

Choose a plan and activate your multi-network eSIM in under five minutes. No contracts, no commitments.

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No contract. Cancel anytime.