Can I still receive a delivery text or 2FA code in Florida?

Yes, as long as it arrives as a standard SMS to your UK number, which keeps working with data roaming switched off.

Keep your UK number while you're in Florida

Q: What if my UK SIM has no signal at all in the US?

Some UK networks need an active roaming pass for voice and text coverage in the US — check with your own network before flying. The eSIM data setup works regardless.

Q: Do I need to do anything when I land back in the UK?

No — your phone reconnects to the UK SIM as normal. The eSIM can be left installed or deleted; it does not renew or charge again.

Q: Does this work for a family with several phones?

Yes — every phone runs the same UK-SIM-for-calls, eSIM-for-data split independently, and a family bundle covers multiple phones at once.

Hand holding a smartphone with a scenic Florida beach view

The question we get most before people buy: "if I put a US eSIM on my phone, do I lose my UK number?" No. Your UK SIM stays exactly where it is, in the same phone, doing what it's always done — the eSIM just takes over the data so your network never gets the chance to charge you for it. Here's exactly how the two work side by side, and how to set it up so nothing slips through.

How dual SIM actually works

Every eSIM-capable phone (iPhone XS or newer, most Galaxy S20+ and Pixel 3+ models) can run two SIMs at once — your existing physical UK SIM plus the eSIM we email you as a QR code. They're not a swap, they're a pair. Your UK SIM keeps its number, its contacts, its call and text service. The eSIM adds a second line that exists purely to carry data. You choose which line handles what, and for a Florida trip the setup is always the same: UK SIM for calls and texts, eSIM for data.

This is the same trick as carrying a local SIM abroad, minus the fiddly bit of removing your UK SIM and losing it in a hotel bin — the eSIM installs digitally, so the UK SIM never leaves the tray.

The roaming-off checklist

The whole method rests on one setting. Do this and your UK network physically cannot bill you for US data:

Buy your plan before you fly — the QR arrives by email in seconds, and installing it on home wifi doesn't start any clock (you've got 180 days to actually use it).
Install the eSIM while still on UK wifi. Don't activate it yet.
On landing at MCO, RSW, TPA or wherever you touch down: switch the Florida eSIM on and turn data roaming on for that line only.
Go into your UK SIM's line settings and turn data roaming off. Leave calls and texts on.
Set the eSIM as your default line for mobile data (iPhone calls this "Cellular Data"; Android calls it "Mobile data"). This stops the phone quietly falling back to the UK SIM's data when the eSIM signal dips.

Do steps 3–5 in the taxi from the airport if you need to — it takes about a minute, and until you do, both lines just sit there with roaming off, costing nothing.

WhatsApp and iMessage — the things people actually worry about

WhatsApp is tied to your UK number, not to a SIM. Once your phone has any working internet connection — which the eSIM provides — WhatsApp keeps sending and receiving on that same UK number exactly as it does at home. Group chats, voice notes, video calls to the grandparents: all of it rides over the eSIM's data for free, no roaming charge in sight.

iMessage and FaceTime work the same way on iPhone: they're linked to your Apple ID and phone number, not to which physical SIM is active. As long as the phone has data — from the eSIM — blue-bubble messages and FaceTime calls keep working. Android's RCS ("Chat features" in Google Messages) behaves identically, tied to the number and Google account rather than the active data SIM.

The one thing that changes: if a UK friend texts your number using plain SMS instead of WhatsApp or iMessage, that lands on your UK SIM as a normal text — see below for how that's handled.

Texts, calls and bank codes from home

Receiving a standard text or call on your UK number in the US is usually free or low-cost on all four major UK networks — it's sending and data that rack up roaming charges, and you've switched data off. This matters for the two things people worry about mid-holiday:

Bank one-time passcodes. These arrive as an ordinary text to your UK number, which is still live and receiving — nothing about the eSIM setup affects this.
An unexpected call. Answering can trigger a per-minute roaming charge on some plans even with data off — check your own network's rate for voice roaming (it's usually separate from the data passes covered in our network-by-network roaming comparison). The easy habit: let unknown numbers go to voicemail, then call back over WhatsApp using the eSIM's data — free, and just as clear.

If you want to make outgoing calls freely without watching a per-minute meter, WhatsApp Call, FaceTime Audio or Google Meet all route over the eSIM's data and reach any phone or the same apps on the other end, all attached to your normal UK identity.

Setting the lines correctly on iPhone and Android

A five-minute job, best done before you fly so you're not fiddling with settings in arrivals:

iPhone: Settings → Cellular → label your two lines (e.g. rename the eSIM "Florida Data" so you can't mix them up). Under "Cellular Data", pick the Florida eSIM. Turn "Allow Cellular Data Switching" off if you want to be certain the phone never quietly taps the UK SIM's data.
Samsung/Android: Settings → Connections → SIM manager. Set "Mobile data" to the eSIM. Leave "Calls" and "SMS" pointed at the UK SIM. Most Android phones show a small icon per line in the status bar so you can check at a glance which is doing what.
On both platforms, double-check after landing — some phones reset data roaming preferences on a fresh network handshake, so a 10-second glance at Settings once you're connected is worth it.

Quick answers

Will people know I'm not on my normal SIM? No — calls and texts still show your normal UK number to everyone you contact. Nothing about how you appear to others changes.

Can I still receive a delivery text or 2FA code? Yes, as long as it arrives as a standard SMS to your UK number — that keeps working with data roaming off.

What if my UK SIM has no signal at all in the US? Some UK networks don't have a US roaming partner for voice/text unless you've got an active roaming pass or plan that includes it — check with your own network before you fly. The eSIM setup still works for data either way; it's only the voice/text side that depends on your UK network's own US coverage.

Do I need to do anything when I land back in the UK? No — once you're back on UK soil your phone reconnects to the UK SIM as normal. You can leave the Florida eSIM installed (it's valid for 180 days from install and doesn't renew or charge again) or delete it — either is fine.

Does this work for a family with several phones? Yes — every phone does the same UK-SIM-for-calls, eSIM-for-data split independently. Our Florida guide and how to pick a USA eSIM guide both cover the family bundle if more than one phone in your party needs data.

More on compatibility (which iPhones/Samsungs qualify, hotspot use, what happens if you run out of data) is in the FAQ.

See Florida plans — keep your UK number