Tourist SIM vs Local Postpaid Vietnam: 30-Day Math

A tourist SIM (prepaid eSIM) is sold online and activates via a QR code in about 60 seconds. No contract is needed — you provide a passport photo, pay once, and data is delivered in daily caps (for example, 5GB per day on our Viettel and Vinaphone plans). The eSIM works alongside your home number via dual‑SIM, so you can keep receiving calls and messages on your regular line.

A local postpaid plan, by contrast, requires a 6‑month or longer visa, a local address (e.g., a rental contract), passport, often a Vietnamese bank account, and a multi‑month contract typically locked to one carrier. Data is usually a monthly pool — for instance, 60GB per month — and the plan includes a Vietnamese phone number capable of receiving incoming calls and SMS. However, no Vietnamese postpaid plan we are aware of includes outgoing calls or SMS as part of a tourist‑oriented package; those functions usually require topping up a separate prepaid balance.

Our 30‑day Viettel 5GB/day tourist eSIM costs $18.90. A comparable Viettel postpaid plan (e.g., Viettel 60GB/month) is advertised by Viettel at around 200,000 VND (~$8) per month, plus taxes and registration fees. The tourist SIM's daily cap gives you up to 150GB over 30 days (5GB/day × 30), while the postpaid plan offers 60GB total. After reaching the daily cap, the tourist SIM is throttled (typically to a lower speed, though the exact throttle speed is set by the carrier and may vary). The postpaid plan may also have a fair‑use policy after 60GB.

For a 30‑day stay, the tourist eSIM costs $18.90 vs. roughly $8 for postpaid — but the postpaid price comes with significant upfront commitment: registration time (1–3 hours at a store), a 12‑month contract, and potential early termination fees (often 50% of remaining months). For a 90‑day trip, three 30‑day tourist eSIMs would total ~$56.70, while postpaid would be ~$24 plus the same registration hassle. The break‑even point shifts as your stay lengthens, but the time and paperwork required for postpaid rarely make sense for stays under several months.

A tourist SIM is available to any foreign visitor with a passport. You buy it online (or at the airport) and receive the QR code within minutes. Activation is instant — scan the code, install the profile, and you're connected. No ID is needed beyond a photo of your passport. The eSIM works on any non‑Chinese eSIM‑compatible phone (iPhone XS and later, most modern Android phones). There is no contract, no monthly bill, and no termination fee.

A postpaid plan requires a visa that permits long‑term stay (business, residence, or work), a rental contract or utility bill as proof of address, a Vietnamese bank account (or a VND cash deposit), and an in‑person visit to a carrier store. The process typically takes 1–3 hours. Postpaid plans usually lock you into a 12‑month contract; leaving early triggers a penalty (often 50% of the remaining balance). If you are in Vietnam for only 30–90 days and do not have a bank account or long‑term visa, the tourist SIM is the only realistic option.

Both tourist SIMs and postpaid plans run on the same three national networks: Viettel, Vinaphone, and Mobifone. There is no coverage advantage to postpaid; the signal strength you get depends on your location and carrier choice. Tourist SIMs generally have the same data priority as normal prepaid. Postpaid may have slightly higher QoS priority during congestion, but for everyday use — maps, social media, video calls, streaming — the difference is negligible.

A key distinction: postpaid plans include a Vietnamese phone number that can receive incoming calls and SMS (useful for bank OTPs, Grab driver contact, delivery apps). Our Vinaphone tourist eSIM (30‑day, $18.90) also includes a real Vietnamese number for receiving incoming calls and SMS, which is rare for a tourist SIM. Our Viettel eSIM and Skyfi eSIM are data‑only — they do not provide a local number. If you need a local number for essential services, choose the Vinaphone option or consider postpaid if you qualify.

For stays of 30 to 90 days, a tourist eSIM is almost always the better choice — unless you plan to apply for residency or specifically need a local number for banking (and are willing to go through the postpaid process). The tourist eSIM gives you instant connectivity, no commitment, and full 4G speeds from day one. The cost difference is small enough that the convenience of not dealing with contracts and registration is well worth it.

For stays of 90+ days, postpaid becomes significantly cheaper on a per‑month basis, but only if you have the required documents and plan to stay long‑term. A middle‑ground approach: buy a tourist eSIM for immediate connectivity when you arrive, then switch to a postpaid plan during your first month if you qualify. Our 30‑day Viettel and Vinaphone eSIM plans serve exactly this bridge role — no commitment, full speed, simple installation.

Visit simvietnam.telebox.vn and choose either the Viettel 30‑day 5GB/day ($18.90) or the Vinaphone 30‑day 5GB/day ($18.90). No account is needed — pay by card or cryptocurrency, and you'll receive the QR code by email within two minutes. Install the eSIM before your trip by scanning the QR code with your phone's camera; the carrier profile loads in about 30 seconds.

Turn on mobile data after landing. If it doesn't work immediately, go to Settings > Cellular > SIMs and make sure this line is active. If still not, restart your phone. For iPhone 14 and later (US models), ensure your main eSIM slot is free — you can have multiple eSIMs but only one active for data at a time. For Chinese or Hong Kong iPhone models, eSIM is not supported; contact us for a physical SIM alternative.