Want to explore the vast US without worrying about losing connection? No problem! Let Living Nomads help you find the perfect US travel SIM or eSIM for your journey.
Traveling to the US is a dream for many, but imagine landing at JFK (New York) or LAX (Los Angeles) and wanting to call an Uber to your hotel, only to find your phone stuck loading because there’s no internet. Or worse, picture yourself driving along Route 66 when Google Maps suddenly stops working. Don’t let connectivity issues ruin the trip of a lifetime.
In this article, we’ll break down everything you need to know about US travel SIMs and eSIMs—from prices and network speeds to tips for snagging the best deals. Trust me: just 10 minutes of reading this could save you a fortune and spare you a heap of unnecessary hassles.
Why Do You Need a Top-Notch US Travel SIM?
Many travelers think they can just rely on public Wi-Fi in the US to save money. But the reality isn’t quite so rosy. Free Wi-Fi in major cities like San Francisco or Chicago is often slow, insecure, and requires a tedious sign-up process.
Internet Connectivity Is the “Oxygen” of Any Trip
Traveling to the US without internet access is like wandering through a fog. You need the internet to:
- Check maps: The US road system is incredibly complex, featuring highways with 10 to 12 lanes. Miss a single turn, and you could waste 30 minutes just trying to turn around.
- Use ride-hailing apps: Uber and Lyft reign supreme in the US. Without a SIM card, you’d be forced to pay exorbitant fares for traditional taxis at the airport.
- Check-ins and staying in touch: Show off photos at the Statue of Liberty or video call family via Zalo or Messenger.
- Information search: Check museum opening hours, read restaurant reviews on Yelp, or book sightseeing tickets online via Klook to skip the lines.
Save Money for Other Experiences
Using international roaming services from Vietnamese carriers can send your phone bill soaring to tens of millions of VND after just a few days. In contrast, a US travel SIM or eSIM costs only a few hundred thousand to just over a million VND for a full month of worry-free usage.
Popular US Travel SIMs: Which Type Suits You?
The US SIM market is currently divided into two main categories: traditional physical SIMs and modern eSIMs. Each type has its own pros and cons suited to different traveler needs.
Physical SIMs: The Reliable, Tried-and-True Choice
This is the tiny plastic card we are all familiar with. Simply remove your Vietnamese SIM and insert the US SIM—that’s it.
- Pros: Compatible with most phone models, old and new (provided the device isn’t carrier-locked). Easy to lend to others or switch between different devices.
- Cons: Risk of losing the original SIM when swapping cards. You have to wait for home delivery or visit a store to purchase one.
US eSIMs: Technology That Breaks All Boundaries
An eSIM (embedded-SIM) is a digital SIM built directly into the phone’s circuitry. No physical swapping is required; simply scan a QR code, and the device automatically connects to the network.
- Pros: Purchase and activation happen in a flash (usually taking just 60 seconds). It can be used alongside your primary Vietnamese SIM to receive banking OTP messages. Notably, newer iPhone models in the US market have completely eliminated the physical SIM slot, making eSIM the mandatory choice.
- Drawbacks: Compatible only with newer phone models (iPhone XS, Google Pixel 3, Samsung S20, and later). Some budget eSIM plans offer data only, without a phone number for calls or SMS texting.
Detailed Review of the 3 US Provider Giants: T-Mobile, AT&T, and Verizon
For the smoothest experience, choose SIMs from domestic US carriers rather than roaming SIMs from third countries (such as those from Hong Kong or Thailand).
T-Mobile: The “Go-to” Choice for Travelers
T-Mobile is currently the most popular carrier among Vietnamese travelers due to its balance of price and performance. T-Mobile’s 5G network is exceptionally robust in urban areas.
- Coverage: Excellent in major cities and along major highways, ensuring a stable connection throughout your trip.
- Speed: Ultra-fast 5G network that seamlessly handles everything from map navigation and social media browsing to watching TikTok videos or high-quality 4K movies without lag.
- Flexible plans: Offers a wide variety of options, ranging from unlimited data plans to daily data allowances (e.g., 1GB, 2GB, or 3GB), suitable for various trip durations such as 10, 15, or 30 days.
Notably, travelers can easily find and purchase high-speed US eSIM plans on the Klook platform at highly competitive prices. This technology solution offers exceptional convenience by enabling the quick purchase and receipt of a QR code via email, allowing for instant activation—either before departure or immediately upon landing—without the need for the complex process of swapping out physical SIM cards.
AT&T: The King of Remote Area Coverage
If your itinerary involves endless road trips or visits to majestic national parks like Yosemite and the Grand Canyon, AT&T is a true lifesaver.
- Coverage: Renowned for its extensive coverage area, AT&T keeps you connected even in the most remote parts of the U.S.
- Speed: Consistently stable; while it may not offer the “blazing” urban speeds of T-Mobile, you will rarely experience unexpected connection drops.
- Plans: Costs are slightly higher than the competition, but it is a worthwhile investment for total peace of mind regarding connectivity.
Verizon: The Premium Choice
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Verizon is famous for its top-tier network service but is notoriously picky about international devices. Many smartphones brought from Vietnam risk becoming useless “bricks” because they are incompatible with the carrier’s specific 4G/5G frequency bands.
(*) Advice: Only consider Verizon if you own the latest international-version iPhone and are willing to pay a premium price for a high-end experience.
US Travel SIMs vs. eSIMs: A Comparison
| Criteria | Physical SIM | eSIM |
|---|---|---|
| Convenience | Requires assembly/disassembly; waiting for delivery. | Scan the QR code and receive it instantly via email. |
| Keep your Vietnamese SIM card | Must be removed (except for dual-SIM models). | Can be used alongside normally. |
| Compatibility | Very high (all international models) | Only newer models support eSIM. |
| Price | From 300,000 VND | From 100,000 VND |
| Calling in/out function | Usually accompanied by a US phone number. | Depends on the plan (usually a data-only SIM) |
Should You Buy a US Travel SIM Beforehand or After Arrival?
This is a question we frequently receive from travel enthusiasts. The short and smartest answer is: Order your SIM or eSIM on Klook right now!
Why Is Ordering an eSIM on Klook the Perfect Choice?
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- Cost-effective: Booking via Klook is often 30–50% cheaper than purchasing directly at US airport counters. You can use the money you save to buy fun souvenirs instead.
- Dedicated support from Klook: You won’t have to worry about language barriers or technical issues. Klook provides quick answers to all your questions, giving you total peace of mind throughout your trip.
- Save time & energy: Get connected the moment you land! No need to waste time queuing at the airport or struggling to find a SIM card counter after a long, tiring flight. Simply turn on your phone, connect, and start sharing your journey online right away.
When should you buy directly in the US?
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Only if you plan to stay long-term (over 3 months) and need a local phone number for banking procedures or official identification documents; in that case, US postpaid plans would be the most suitable choice for your needs.
Pitfalls to avoid when choosing a US SIM card
Museum of Modern Art (MoMA) Ticket in New York
Don’t be swayed by advertisements promising rock-bottom prices. Keep these three things in mind:
- Check for network locks: If your phone is carrier-locked (e.g., a locked iPhone), you cannot use any travel SIM cards. Ensure your device is unlocked (international version) before ordering.
- Frequency bands: The US uses different 4G/5G frequency bands compared to Vietnam (e.g., Bands 2, 4, and 12). Older phone models or devices intended for the Chinese domestic market may fail to pick up a signal, even if the SIM card itself is functional.
- “Fair Usage Policy”: Many SIM cards are advertised as “unlimited,” but in reality, once you exceed the daily high-speed allowance (typically 2GB–3GB), speeds are throttled to a crawl (128kbps)—sufficient only for sending text messages.
A-to-Z Guide to Activating US SIM Cards and eSIMs
For Physical SIM Cards
- While the plane is still in Vietnam: Do not insert the SIM card into your device.
- Upon landing in the US: Turn off your device and insert the US SIM card into the primary SIM slot.
- Turn on your device, go to the mobile settings, and enable Data Roaming.
- Wait 1–3 minutes for the device to connect to the network. If there is no signal, try toggling Airplane Mode on and off.
For eSIMs
- You will receive a QR code via email after completing your payment on Klook.
- Go to Settings -> Cellular (or Mobile Data) -> Add eSIM.
- Scan the QR code and follow the on-screen instructions.
- Note: You need a Wi-Fi connection to complete this step (it is best to do this before leaving for the airport in Vietnam).
Tips for Unlimited Data Usage Without Running Out
Empire State Building Observation Deck Ticket
Even with an unlimited data plan, applying the following tips will ensure your internet experience remains smooth and stable:
- Manage automatic updates: Manually disable automatic app downloads in your settings to avoid wasting bandwidth.
- Utilize offline maps: When connected to stable Wi-Fi, download map data for your upcoming destinations in advance to ensure seamless navigation during your trip.
- Prioritize fixed networks: Use Wi-Fi at your accommodation for data-heavy tasks to conserve your mobile data for when you are out and about.
To choose the perfect connectivity companion for your trip, consider your specific needs. If convenience and speed are your top priorities, an eSIM is the best choice—provided your device supports the technology. However, if you prioritize broad compatibility and extensive coverage, a traditional physical SIM remains a reliable option for any device.
Also, be sure to compare and select the right plan—such as a daily data package or a fixed-data bundle—on Klook to optimize costs and secure the best deals.
Visit Klook now to book the perfect travel SIM and get ready for an unforgettable experience in the United States!
Some best day tours, trips, activities and transfer services, tickets in, from and to New York you can refer to
- Klook Pass New York City
- Aladdin Broadway Show Ticket in New York
- Summit One Vanderbilt Ticket
- LEGOLAND® New York Ticket
- The Lion King Broadway Show Ticket in New York
- 60 Minute Statue of Liberty and Ellis Island Cruise in New York
- Empire State Building Ticket in New York
- New York Big Bus Hop-On Hop-Off Tours (Open-Top)
- The Edge Observation Deck Ticket in New York
- Top of the Rock Ticket in New York
- The Museum of Modern Art Ticket in New York
- One World Observatory Ticket in New York
- The National 9/11 Memorial Museum Ticket in New York
- Go City – New York Explorer Pass
- American Museum of Natural History Ticket in New York
- Spyscape Spy Museum Ticket in New York
Check out more US guide here.
