Does an eSIM replace my physical SIM card?
No — an Aria Mobile travel eSIM runs alongside your normal UK SIM, not instead of it. Your physical SIM keeps your number active for calls and texts, while the eSIM handles mobile data abroad. You decide which line is used for what in your phone's settings, so you stay reachable on your usual number without paying roaming charges.
No — an Aria Mobile travel eSIM runs alongside your normal UK SIM, not instead of it. Your physical SIM keeps your number active for calls and texts, while the eSIM handles mobile data abroad. You decide which line is used for what in your phone's settings, so you stay reachable on your usual number without paying roaming charges.
Dual SIM, not replacement
Modern iPhones and most Android flagships support Dual SIM Dual Standby (DSDS), which means you can run a physical SIM and an eSIM at the same time. Your UK SIM keeps your number live so WhatsApp, iMessage, and SMS-based 2FA codes still arrive. The Aria Mobile eSIM is set as the data line, so apps and browsing go through our network — usually a local partner — at local data rates.
How to set the right line for data
On iOS go to Settings → Cellular and pick your travel eSIM under Cellular Data. Turn Data Roaming on for that line only. On Android open Settings → SIM cards and choose the eSIM for Mobile data while leaving your UK SIM as Default for calls. This split keeps your phone bill predictable: voice and SMS stay on your home plan, data switches to ours.
When you might disable your home SIM
If your home carrier auto-enables expensive roaming, some travellers prefer to turn off the physical SIM's data and roaming entirely while abroad, leaving only the Aria Mobile eSIM active for internet. You can still receive calls and texts on your number unless you also disable Voice & Data. Always check with your home carrier before disabling lines if you rely on it for 2FA.
People also ask
- 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.
- Do I keep my UK number when I use a travel eSIM?
Yes. A travel eSIM is added alongside your existing line, not in place of it. Your UK SIM (physical or eSIM) stays active for calls, texts and WhatsApp on your normal number. The travel eSIM is used only for mobile data — so it costs you nothing extra to receive a text from your bank or take a call from home.
- Will WhatsApp work on my UK number abroad?
Yes. WhatsApp is tied to your phone number, not to your SIM card or network. As long as your UK line is still active on the phone (even if data roaming is off), WhatsApp continues to send and receive messages on your UK number — using the travel eSIM's data connection. Voice and video calls work the same way.
- eSIM vs local SIM card abroad — which should I use?
A travel eSIM beats a local SIM in almost every case. You install it before you fly, you keep your UK number, and you avoid the airport queues and ID paperwork that local SIMs now require in most countries. Local SIMs are only cheaper for stays longer than three to four weeks where you genuinely need a local number.