A friend of mine recently decided that he wants to switch to an eSIM. He said he no longer wants to fumble with tiny SIM cards or to ask the shop guy for a new tray pin. Rather, he just wants a cleaner phone experience. Honestly, it sounded great on paper. So we sat down together one evening and started weighing the real pros and cons, the way you do when someone is about to make a change they cannot easily undo. And what we found was not exactly what the phone companies put in their brochures. There were things hiding in plain sight that most people do not think about until they are already stuck. Here is what we uncovered.
The first thing that surprised us was how annoying it can be to simply move your number from one phone to another. With a physical SIM, you pull it out and put it in. Done. With eSIM, you are at the mercy of your carrier.
Some carriers make you call customer support, and you need to verify your identity multiple times. Moreover, then wait for them to push a new activation on their end. Some have an app that works smoothly. Others have a process that is so clunky it took my friend’s cousin nearly three hours to activate his eSIM on a new device.
If you are switching phones in a hurry because your screen cracked or your phone was stolen, this friction becomes a real problem. You cannot just pop your SIM into a borrowed phone and keep going. You need the carrier to cooperate, and that cooperation does not always come fast.
Here is something most people do not think about with eSIM. While you don’t need a physical card, your carrier profile, your number, and your plan – all of it is tied to the operating system and the device firmware. Hence, you can also say that all of those live inside your device’s software. This also means that if something goes wrong at the software level, your connectivity can go with it.
We came across a few cases where people updated their phone’s operating system and found their eSIM stopped working. In some instances, a factory reset wiped the eSIM profile entirely. Unlike a physical SIM that you can take out, keep safe, and reinsert, your eSIM has no physical backup sitting in your drawer.
You are trusting that your phone, your carrier, and their systems all stay in sync. Most of the time they do. But when they do not, getting back online is not a simple fix.
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This one caught us off guard a little. When you activate an eSIM, the carrier stores your device profile on their servers. That means your phone and your identity are linked in a way that is more permanent and traceable than a physical SIM.
For most people, this is not a major concern in daily life. But think about it for a moment. If your account is ever hacked, or if someone calls your carrier and convinces them to reassign your eSIM to a different device, the attacker now has your number. This type of attack, often called SIM swapping, is arguably easier to pull off with eSIM because the entire process happens remotely without any physical card to steal.
The people most at risk are those who use their phone number as a second factor for their banking or email accounts. If your number gets hijacked, your accounts could follow.
When you get an eSIM from a carrier, they often send you a QR code to scan during setup. Sounds simple. But here is the catch: that QR code usually works only once.
If you scan it on the wrong device, make a mistake during setup, or your phone restarts mid-activation and something breaks, that QR code becomes useless. You have to contact the carrier again and ask for a new one. If you are travelling internationally and your roaming eSIM code fails during activation, you could be stuck without a working number in a foreign country.
My friend actually experienced something close to this while setting up a travel eSIM before a trip. The first scan did not complete properly, and the code expired. He had to go back to the provider and wait for a new one. Not ideal when you are packing your bags.
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eSIM is growing fast, but it is far from universal. If you travel often or live in a smaller city, you may find that your carrier options are limited in ways they would not be with a physical SIM.
In several countries across South Asia, Africa, and parts of Southeast Asia, many local carriers still do not support eSIM at all. That means when you land somewhere new and want a cheap local data plan, you might not be able to get one on your eSIM slot. You would need a physical SIM anyway.
Even within countries that do support eSIM, prepaid options are sometimes not available in the eSIM format. The budget-friendly plans that travellers love are often physical SIM only.
For someone like my friend who travels a fair bit for work, this was a real consideration. The convenience of eSIM shrinks considerably when you are crossing borders and realising your options are narrower than expected.
After all that conversation, my friend did not abandon the idea of eSIM entirely. He just went in with his eyes open. The convenience is real, especially for people who stay in one country, use a reliable carrier, and do not switch phones often. But the hidden friction, the software risk, the privacy concerns, the one-shot QR codes, and the limited global reach are all things worth knowing before you make the switch.
The worst thing you can do is assume it works exactly like a physical SIM, just digital. It does not. It is a different experience with its own set of trade-offs. And like most things in tech, the smoother it looks on the surface, the more you should ask what is going on underneath.