This guide explains how to set up an eSIM and VoLTE on an iPhone, from checking compatibility to installing a travel eSIM before you leave Singapore. The steps focus on travel eSIMs, which let you add a mobile data plan without swapping your usual physical SIM card.
What an eSIM and VoLTE do on your iPhone
An eSIM is a digital SIM that stores your mobile plan on the iPhone itself. For travel, an eSIM from a provider such as TPG Mobile gives you overseas data without needing a physical SIM from a local shop. VoLTE, or Voice over LTE, lets calls use the LTE network instead of older voice networks. On a travel eSIM, VoLTE may be available for calls over supported networks, but its availability depends on the destination carrier and your iPhone model.
Before you start: check iPhone compatibility
Most recent iPhone models support eSIM, but older ones may not. Go to Settings > General > About and look for “Digital SIM” or “eSIM”. If you see it, your iPhone supports eSIM. For VoLTE, the option appears only if your carrier and network support it. Since this varies by device, carrier, and destination, check with the eSIM provider or your home carrier if you are unsure.
How to install a travel eSIM before departure
Installing before you leave Singapore is usually the smoothest way to start using data on arrival. The exact steps can differ slightly depending on the eSIM provider and iOS version, but the general process is as follows.
- Buy a travel eSIM plan from a provider such as TPG Mobile. You will receive a QR code or a manual activation code.
- Make sure your iPhone is connected to Wi-Fi or a mobile network with internet access.
- Open Settings > Cellular > Add Cellular Plan.
- Scan the QR code provided by the eSIM provider, or enter the activation code manually if you did not receive a QR code.
- Follow the on-screen prompts to add the plan. You may be asked to label it, for example “Travel” or “Data”.
- Once added, the eSIM appears in your Cellular list. You can set it as the data line or choose it when you are overseas.
Do not remove your usual Singapore SIM. Keep it in the phone so you can still receive SMS and calls from your home number, though roaming charges may apply. The travel eSIM handles your data while you are away.
Set up VoLTE on your iPhone
VoLTE is usually enabled by default on iPhones when the carrier supports it. To check or change the setting, go to Settings > Cellular > [Your Primary Line] > Voice & Data. If you see “VoLTE” there, ensure it is turned on. If you do not see the option, your carrier or current network may not support VoLTE for that line. For a travel eSIM, VoLTE availability depends on the destination carrier and the plan you purchased, so it may not always appear.
Note that menu wording varies by iOS version and carrier settings. Some iPhones label the option differently, such as “Voice & Data” or “LTE”. If you cannot find VoLTE, update your iPhone to the latest iOS version and check your carrier settings in Settings > General > About for a carrier update.
Manage your data lines after installation
After adding the travel eSIM, you can choose which line uses data. Go to Settings > Cellular > Cellular Data and select the travel eSIM as the data line. You can also enable “Allow Cellular Data Switching” so your iPhone can use your home line if the travel eSIM has no coverage, but be aware that this may trigger roaming charges on your home line.
To avoid accidental data use on your home SIM, consider turning off “Data Roaming” for your primary line in Settings > Cellular > [Your Primary Line]. This ensures that your travel eSIM is the only line using mobile data while overseas.
What to do if your eSIM does not activate
If the eSIM does not activate after installation, first check that you have an internet connection via Wi-Fi. Restart your iPhone and go to Settings > Cellular to see if the plan is listed. If it is still not working, remove the eSIM plan and add it again using the same QR code or activation code. If problems continue, contact the eSIM provider’s support team with your iPhone model and iOS version, as compatibility issues can vary.
For VoLTE not appearing, the cause is often carrier support rather than your iPhone. Not all networks or plans support VoLTE for travel eSIMs. If you are unsure, check with the eSIM provider about VoLTE availability for your destination before you travel.
Practical tips for travelling with an eSIM
- Install the eSIM at least a day before departure so you can test the activation and avoid last-minute issues.
- Keep a screenshot of the QR code or activation code in case you need to reinstall the eSIM.
- Check your data plan balance before you leave, and monitor usage through your iPhone’s Settings or the provider’s app.
- When you land, switch off Wi-Fi and ensure the travel eSIM is selected as the data line. Your iPhone should connect to the local network automatically if the plan is active.
- Remember that eSIMs are for data primarily; for voice calls, you may need to use apps that make calls over the internet, unless VoLTE is supported by the destination carrier.
Setting up an eSIM on your iPhone is straightforward, and most steps can be completed before you leave Singapore. VoLTE may not be available on every travel eSIM, so check the provider’s information for your destination. With the eSIM installed and the right data line selected, you can connect on arrival and avoid the hassle of hunting for a local SIM.
