There's no denying that people absolutely hate wasting time trying to figure out why their phone has suddenly stopped working when they cross a border or try to log into an app or bank account and they can't verify. It's especially infuriating when you urgently need to be able to receive calls or SMS OTPs. Imagine landing at an airport after a 14-hour flight, trying to book an Uber, only to realise the app won't log in or a payment won't proceed because you can't receive a verification code.
The alternative is to pay a premium telco carrier high roaming charges, but this still doesn't guarantee things will work. When your phone line is completely dead, you're basically stuck. Not only that, picking the wrong type of mobile connection can leave you completely stranded. Whether you're travelling for a week, working remotely from a different continent, or just trying to handle separate personal and work lines, you have three distinct options. If you're comparing eSIM vs physical SIM, sorting through the jargon of physical SIMs, eSIMs, and virtual numbers can be frustrating, but picking the right one saves a massive amount of money and stress.
1. The Physical SIM Card (the old faithful)
Everyone is familiar with the tiny piece of plastic you poke out of a cardboard frame with a paperclip. It slots into the side of your phone and manually hooks your device up to a specific mobile provider's towers. You know the drill. Walk into a telco store or 7-11, or airport anywhere on earth, hand over some cash, and walk out with a working local network connection. These are compatible with almost every mobile phone ever built, meaning you never have to check if your hardware is too old to support it. If your phone battery dies completely, you can just pop the plastic chip out, slide it into a friend's device, and immediately start taking calls again.
The danger is that physical cards are incredibly easy to lose by themselves, not to mention leaving your phone in the back of a cab or (even worse) having your device stolen. Losing your physical SIM card means you completely lose emergency contact access on your primary number, and if you're overseas you're basically screwed as there's almost no way to get the number back without returning home.
2. The eSIM (the modern travel companion)
If you're weighing up eSIM vs SIM options, it's important to understand how each technology works. An eSIM is a relatively new type of technology which can be embedded into a modern smartphone instead of plugging in a regular SIM card. When comparing an eSIM vs SIM card, the biggest advantage is that instead of buying plastic and using up one of your valuable SIM slots, you buy a digital profile online and download it straight to your device (generally via a QR code). The setup takes less than a minute and can be done entirely over Wi-Fi. eSIM phone numbers will act the exact same way as a regular SIM card phone number; they're indistinguishable to the person on the other side of the line.
Be warned though that the vast majority of travel eSIM packages are strictly data-only. They don't come with a real local phone number, meaning you can't make standard cellular voice calls or receive legacy SMS verifications. Also, if your phone was manufactured a few years ago, the internal hardware might not support eSIM technology at all, leaving you unable to download the profiles.
3. The Virtual Number App (the ultimate bridge)
Virtual numbers act like real mobile numbers but live entirely inside a software application rather than being inserted into a SIM slot or embedded into a device. They route calls and messages through an internet connection using VoIP technology, and they're not tied to an individual device.
A lot of providers allow you to purchase a dedicated country-specific number online from anywhere in the world without needing to change your actual phone hardware or physically show up in a particular country. They don't use any kind of SIM slot, physical or otherwise. Depending on the quality of the app, you may even be able to have several numbers in one account, or share numbers across devices. In the UK in particular, choosing between an eSIM and a physical SIM depends on what you need but only a small number of providers are able to manage Ofcom's Know Your Customer requirements while providing a reliable and convenient service. As an example, callcooee.com started in Australia and has started offering US and UK virtual numbers to complement their initial offering. We love them because they integrate directly with UK carrier networks, meaning they receive all the important security alerts, government communications, and banking OTPs that standard internet-based numbers often miss. There are no surprise international roaming fees, and you can keep your personal number alive indefinitely while overseas.
The limitation is that a Virtual Number requires an existing data connection (either Wi-Fi signal or an active data plan) or else you won't be able to receive incoming messages and phone calls. Having said that, Cooee has started offering global data plans to help reduce this risk.
Which option is best?
Honestly, whether an eSIM is better than a physical SIM really depends on how you travel and what you need your phone to do. For anyone with an older phone who doesn't want to change, sticking to a physical SIM card makes sense, just be careful you don't lose it when swapping them out.
For holidaymakers who only need cheap map data and WhatsApp access for a week, downloading a temporary travel eSIM is generally the best approach. For remote workers, expats, and frequent travellers who need reliable connectivity across multiple numbers and total peace of mind, a combination of these tools might work best (depending on your budget). As long as you have a reliable data connection, the best option is typically going to be running a virtual number(s) through an app, as you don't give anything up. This is why we think modern providers like callcooee.com are great.
