The Changi Airport Terminal 3 arrivals hall has a row of telco kiosks that do brisk business every morning. Travelers line up to buy Singtel and StarHub prepaid SIMs before heading into the city. If you've done this trip a dozen times, you know the routine: queue, ask for data plan, pay SGD $15–25, wait while the staff activates the card, insert it, realize your phone needs a pin, ask for a pin, wait again. By the time you clear customs and get to a taxi, you've spent 25 minutes on the process.
That's a best case. Worst case is a SIM that doesn't activate until you've already paid for the taxi on hotel Wi-Fi.
The eSIM alternative is different in every meaningful way — but not all eSIM products are the same either. Here's an honest breakdown of what you're actually comparing.
The Physical SIM Experience in 2025
Physical SIM cards have a few things going for them. They're available at any airport in the world. They work in devices that don't support eSIM — older Android phones, some budget handsets, a lot of corporate-issued BlackBerry era devices still in circulation at large companies. If you travel once every few months and don't mind the airport queue, a local prepaid SIM is a reasonable option.
The problems compound with frequency. Each country requires a different SIM. The drawer in your desk that contains 11 partially-used SIM cards from 11 different countries is not a connectivity strategy — it's a logistics problem. You forget which SIM has credit, you lose the ejector tool, you drop the card on the taxi floor. These aren't hypotheticals. They're what actually happens.
For business travelers making three or more international trips per month, the SIM swap ritual adds up to meaningful time loss. Across a team of 10 road warriors each visiting four countries per quarter, the aggregate time spent buying, inserting, and troubleshooting physical SIMs is several dozen hours per year.
What an eSIM Actually Is
An eSIM (embedded SIM) is a chip soldered directly onto your phone's motherboard. Instead of inserting a physical card, you download a carrier profile onto the chip. The profile contains the same data a physical SIM contains: network authentication credentials, your phone number (for plans that include one), and your plan entitlements.
The GSMA SGP.22 specification, which governs how eSIM profiles are delivered, has been standard since 2017. Apple began including eSIM support in iPhone XS in 2018. By iPhone 14, US-market devices shipped with no physical SIM slot at all. Samsung Galaxy S-series phones have supported eSIM since the Galaxy S20. As of 2025, GSMA estimates that over 60% of newly shipped smartphones globally support eSIM.
The limitation is device compatibility: if you have a device more than four or five years old, or a low-end Android, it likely does not have eSIM support. Check Settings > General > About on iOS, or Settings > Connections > SIM card manager on Samsung to confirm.
Where Most eSIM Products Fall Short
Most travel eSIM providers give you a QR code and a PDF with a list of APN settings. The APN (Access Point Name) is the network gateway address your phone uses to route data traffic. Different carriers use different APNs. If your phone doesn't automatically detect the right APN for the eSIM you installed, data won't work — or works only in one direction.
This is a frequent point of failure. Reviews for several major eSIM competitors — including Airalo and Holafly — include consistent complaints about needing to manually enter APN settings, especially on Android. iOS handles this better, but not perfectly.
The other common failure is coverage. eSIM providers list 100+ countries on their marketing pages, but the underlying carrier agreements vary enormously. A country listed as "covered" might have a single carrier agreement with a network that doesn't support LTE in rural areas. You won't know until you land.
How Truely Handles Activation
Truely's activation model pushes the configuration work to the carrier side rather than the device side. When you install a Truely eSIM profile, the profile includes pre-configured APN data and network priority settings for every carrier in Truely's agreement network. Your device doesn't have to discover these settings — they're already embedded in the profile.
When your phone registers on a local network at your destination, Truely's platform sends an automatic provisioning update that confirms the plan and activates data. The user action required is exactly zero. You land, you unlock your phone, the mobile data icon appears. That's it.
This approach requires more engineering on the carrier side and more rigorous carrier agreement terms — Truely's contracts specify the provisioning API behavior required for automatic activation. It's also why Truely's carrier onboarding takes longer than some competitors: agreements take time to negotiate correctly.
Pricing: What You're Actually Comparing
A local SIM in Thailand (DTAC or AIS) runs approximately THB 299 ($8.50) for 30 days of 4G data with a reasonable data cap. That's a competitive price for a single-country trip.
A Truely weekly plan for Thailand costs $9.99 for seven days of unlimited data. For a short business trip, the prices are roughly comparable — but you bought the Truely plan before you left home, installed it in 90 seconds, and didn't queue at a kiosk.
Where Truely becomes clearly more cost-efficient is multi-country travel. If a trip covers Singapore, Malaysia, and Indonesia, three separate local SIMs cost $8–15 each plus the time to buy them. A Truely Southeast Asia regional plan covers all three for a flat weekly rate. The math favors eSIM at any travel pattern that crosses more than one border.
Device Compatibility: The Only Real Limitation
Every limitation of eSIM over physical SIM comes down to one thing: device support. If your device supports eSIM, the comparison is straightforward — eSIM wins on every axis that matters for frequent travelers. Faster setup, no physical handling, dual SIM capability, pre-trip purchase, global coverage from a single provider.
If your device doesn't support eSIM, that's the whole conversation. You buy a local SIM or use your carrier's roaming plan and accept the cost. There's no workaround — eSIM requires hardware support that can't be retrofitted.
For companies issuing devices to road-warrior employees, this is worth including in the device procurement checklist. The difference between issuing eSIM-capable and non-eSIM-capable phones to a team that travels internationally four times per year is real cost and real time — measurable across a finance team's expense reconciliation data.
The One Use Case Where Physical SIM Still Wins
Shared devices. If two people need to use the same SIM — handing a data connection from one colleague to another — a physical SIM card is still the easier option. eSIM profiles are tied to specific devices. You can transfer a profile, but the process is more involved than pulling a card out and handing it over.
For individual travelers with modern devices, this case rarely applies. But for teams sharing equipment, or for travelers who rotate between multiple personal devices, physical SIMs retain a logistical advantage in that specific scenario.
The Practical Recommendation
If you have an iPhone 12 or newer, any Samsung Galaxy S21 or newer, or most flagship Android phones from 2022 onward: use a travel eSIM. Buy before you leave. Spend the activation time in your living room, not in an airport queue. Arrive connected.
If you're not sure whether your device is compatible: check the GSMA's official eSIM device registry at gsma.com/esim, or search your device model with the query "eSIM support." The answer is definitive in 30 seconds.