Havenwise vs Fuse Mobile

Havenwise is an easy-to-use control and optimisation system for your heat pump. Connect via our app in just a few minutes, no installer needed! We connect directly to your internet-connected Vaillant, Mitsubishi or Samsung heat pump, so most users need no extra hardware. Havenwise automatically learns how your home heats up and cools down. Our smart software takes into account your energy tariff, local weather, and your comfort to keep your home warm and water hot for the lowest possible bill. Havenwise works great with time-of-use tariffs to shift your heating out of expensive peak periods and into the cheapest times of day. For homes with solar panels, we can shift usage to warmer and sunnier periods. For batteries, time-of-use optimisation can be toggled on and off depending on your preference, to take advantage of tariffs or keep your heat pump running low and slow for maximum efficiency. Our excellent support is always available to answer questions and keep you informed and confident about your home heating needs.

The UK's first multi-network eSIM. Fused. Fuse connects you to EE, Three, Vodafone, and O₂ through one eSIM — automatically switching to the strongest signal, wherever you are. No more "no signal" moments. No more network lottery. WHY FUSE • Every UK network, one eSIM. Your phone fuses all four major UK networks into a single connection. When one drops, we switch you to the next strongest — automatically. • See it happen in real time. Watch live network switches in your activity timeline. Know exactly which network is serving you, and when. • Pay only for data. Flexible plans, no contract. Pause or cancel anytime. No commitments, no fine print. • Live in 60 seconds. No SIM card, no store visit. Scan once, install, you're online. • Honest usage tracking. See every byte and which network served you — broken down across EE, Three, Vodafone, and O₂. • Real support. We usually reply in under 2 hours. No bots, no scripts, no queues. CHOOSE YOUR PLAN Three plans — light, regular, heavy — built around real UK data habits. Switch between them anytime from the app. See full pricing and allowances when you sign up at fusemobile.co.uk or in the app. HOW IT WORKS 1. Choose your plan and check out at fusemobile.co.uk or in-app. 2. Install your Fuse eSIM in 60 seconds — direct install on iPhone, no QR code needed. 3. Your phone auto-connects to the strongest UK network. When signal drops, we switch you. 4. Manage your account, view usage, pause or change plan — all from the app. DATA-ONLY eSIM Fuse is a data-only service — you get cellular data, not voice calls or SMS. Use WhatsApp, FaceTime, iMessage, or any internet calling app for communication. Designed for the way people actually use phones in 2026. ABOUT FUSE Fuse Mobile is a UK telecommunications service provider — a regulated MVNO operating on Telnyx wireless infrastructure with multi-network UK roaming. We're built for people who want connectivity that just works, without the lock-in of traditional carriers. Have questions? Tap "Help" in the app or visit fusemobile.co.uk/help. We're here.