Set Up eSIM iPhone 16 Step-by-Step Guide

You just grabbed an iPhone 16 and booked a trip. Now you want to skip the roaming fees and stay connected with a travel eSIM. The setup is surprisingly quick once you know the steps. This guide walks you through buying, installing, and activating a travel eSIM on any iPhone 16 model, using real 2026 plans from providers we compare on NomadCue.

Before you start: a quick compatibility check

Every iPhone 16 supports eSIM natively. If you bought the phone in the US, it's eSIM-only (no physical SIM tray). Models sold in other countries may still have a nano-SIM slot, but you don't need it for this setup. Make sure your iPhone is carrier-unlocked. A locked phone won't let you add a second eSIM from a travel provider. Also update to the latest iOS 18 version for the smoothest experience.

Step 1: Buy a travel eSIM plan

Head to one of the eSIM stores we follow on NomadCue. You'll find Airalo, Holafly, Nomad, Saily, aloSIM, Ubigi, and plenty of other solid names like Yesim, Instabridge, Jetpac, Maya Mobile, BNESIM, and Roamless. Pick your destination, data amount, and duration. In 2026, prices are friendlier than ever. For example:

Airalo: 1 GB for the UK over 7 days runs about $5. A 3 GB global plan (30 days) goes for $9.50.
Holafly: unlimited data in Europe for 7 days is $19; 10 days for $34.
Nomad: 10 GB of data in Thailand, valid 30 days, often priced around $12.
Saily: a 1 GB global starter pack (7 days) costs $3.99.
Ubigi: a 10 GB Japan plan for 30 days sells at $17.
aloSIM: 5 GB for the USA, 30 days, from $16.

After purchase, you'll receive a QR code and a manual set of activation details (an SM-DP+ address and a code) via email. Many apps also offer one-tap installation, but the QR method works across all providers.

Step 2: Install the eSIM on your iPhone 16

The easiest route is to scan the QR code with your iPhone camera. Open the Camera app, point it at the code, and tap the yellow "Cellular Plan Detected" notification. Then hit "Continue" and "Add eSIM." If you don't see the notification, go to Settings > Cellular > Add eSIM, then choose "Use QR Code."

Some providers let you install directly from their app. Airalo's app, for instance, can push the eSIM profile with a single tap. If you're given manual details instead, select "Enter Details Manually" on that same Add eSIM screen and type in the SM-DP+ address and activation code.

During installation, name your new line something recognisable, like "Travel" or the country name. This label appears in settings and helps you avoid mix-ups later.

Step 3: Set the travel eSIM as your data line

Once installed, return to Settings > Cellular. You'll see your primary line (your regular carrier) and the new travel eSIM. Tap the travel line and confirm that "Turn On This Line" is enabled. Then turn on Data Roaming for this line. Most travel eSIMs require data roaming to be toggled on, even though you're using a local partner network.

For data-only travel eSIMs

Most travel eSIMs don't come with a phone number; they're pure data. That's perfect because you can keep your primary number active for calls and texts while the travel eSIM handles the internet. Here's the setup:

Go to Settings > Cellular > Cellular Data and select the travel eSIM. This routes all mobile data through the travel plan.
Under Settings > Cellular > Default Voice Line, choose your primary line. That way, outgoing calls use your regular number.
Tap your primary line, and make sure Data Roaming is off. You don't want your home carrier's data to kick in and trigger charges.

Apps like WhatsApp, iMessage, and FaceTime automatically use the travel eSIM's data. iMessage and FaceTime will still show your regular phone number if it's registered with Apple, even though the data comes from the travel line.

If you have an eSIM with a phone number

A few Holafly and BNESIM plans include a voice number. In that case, you can set the travel eSIM as your default voice line, but be aware that traditional phone calls and SMS may use a different billing system. For most travellers, sticking to data-only and using internet calling apps is simpler and cheaper.

Step 4: Test the connection before you fly (or right after landing)

After setup, turn off Wi-Fi on your iPhone and see if you get a data signal. In many cases, the travel eSIM will connect to a local network even at home, because it roams on a partner carrier. But be careful: some plans start the validity clock the moment you first connect to any network. Others wait until you actually use data. To be safe, read your provider's activation policy. If you're unsure, simply wait until you land at your destination. Then toggle Airplane Mode off, and the eSIM should connect within a minute.

Common questions

Can I keep my home number active for calls and texts?

Yes. Leave your primary line enabled and set it as the voice line. You can still receive SMS (watch out for carrier pay-per-use rates). Incoming calls will ring, but answering may trigger roaming fees. Instead, let them go to voicemail and call back with WhatsApp or FaceTime Audio over the travel eSIM's data.

Does the travel eSIM expire?

Yes. Every plan has a validity window, typically 7, 15, or 30 days. Unused data does not roll over. If you run out, top up through the provider's app if they offer it (Airalo and Nomad let you add data) or buy a fresh eSIM.

What happens if I get a new iPhone mid-trip?

Travel eSIMs are usually tied to the device. Apple's eSIM Quick Transfer might work for some plans, but many travel providers treat a new device as a separate purchase. Given the low cost, the easiest fix is to buy a new plan for your replacement phone.

Bottom line

Setting up a travel eSIM on an iPhone 16 is a handful of taps. The real decision is which plan gives you the best value for your trip. Our comparison tool at NomadCue lets you stack Airalo, Holafly, Saily, Nomad, and the rest side-by-side, so you can lock in the right data and price before you even pack. Grab your plan, follow these steps, and you're connected the moment you step off the plane.