How does an eSIM work?
When you buy an eSIM you receive a QR code or activation link. Your phone reads it, downloads a mobile profile onto its built-in eSIM chip, and connects to the local network the carrier has roaming agreements with. From that point it behaves exactly like a physical SIM — except you can install several profiles and switch between them in Settings.
When you buy an eSIM you receive a QR code or activation link. Your phone reads it, downloads a mobile profile onto its built-in eSIM chip, and connects to the local network the carrier has roaming agreements with. From that point it behaves exactly like a physical SIM — except you can install several profiles and switch between them in Settings.
Step-by-step
1. You buy a plan. A.R.I.A Mobile generates a unique activation code tied to your data allowance. 2. You scan the QR code in your phone's mobile data settings (or tap a one-tap install link on iOS 17+). 3. The profile downloads over your existing Wi-Fi or mobile connection. It's a small file — under a megabyte. 4. You name and enable the plan. Most travellers label it by destination ("Dubai 7 days") so they can find it later. 5. The phone selects a partner network at your destination automatically the moment you land.
Behind the scenes
Your phone contains an eUICC (embedded Universal Integrated Circuit Card). This is a programmable chip certified by GSMA — the same standards body that defines physical SIMs. When you install an eSIM, the carrier sends a signed profile to that chip via a secure server (SM-DP+). The profile contains the network keys, IMSI, and APN settings — exactly the data a plastic SIM would carry.
The only difference is delivery: software instead of plastic.
People also ask
- What is an eSIM?
An eSIM is a digital SIM card built into your phone. Instead of inserting a plastic SIM, you scan a QR code or tap a link and a mobile plan is downloaded onto a secure chip inside the device. It takes about a minute and works alongside your normal SIM, so you can keep your home number while using a travel data plan abroad.
- Can I have two eSIMs active at the same time?
Yes. Modern iPhones (XS and later) and most flagship Androids let you store many eSIM profiles and have two active at once — typically your home line plus a travel eSIM. Calls and texts route through whichever line you choose as default, while data can be set to use the cheaper travel eSIM automatically.
- Is my phone eSIM compatible?
Almost every flagship phone released since late 2018 supports eSIM. That includes all iPhones from XS onward, Google Pixel 3 and later, and Samsung Galaxy S20-and-newer plus the Z Fold and Z Flip ranges. The other requirement is that the phone is unlocked to other networks — most UK contract phones are unlocked by default since 2021.
A.R.I.A Mobile is a global eSIM connectivity platform built for travellers, athletes, teams and businesses. It provides instant digital connectivity in more than 180 countries and powers modern communication tools such as WhatsApp, Teams, Zoom, FaceTime, Telegram, Maps and Email. Learn more.