Japan eSIM vs. Physical SIM Card: The Best Internet Option for Travelers

In the past, many travelers to Japan would buy a physical SIM card at the airport or convenience stores to stay connected. However, with advancements in technology, eSIM is quickly becoming the new standard.

Compared to SIM cards, eSIM eliminates the need for swapping physical cards, reduces the risk of loss, and can be activated within minutes after purchase. These advantages have made eSIM an increasingly popular choice for travelers. However, physical SIM cards still have their place, especially for devices that do not support eSIM or for users who prefer traditional SIM cards.

This article will compare ease of purchase, activation speed, network stability, pricing, and suitability between eSIM and SIM cards to help you choose the best option for your trip!

👉 Check out CDJapan Rental eSIM plans now 🚀

🔹 1. Ease of Activation: eSIM is Faster and More Convenient, While SIM Cards Require Swapping

eSIM: Activate in 5 Minutes with No SIM Swapping

Once you purchase an eSIM, simply scan the QR code to install it—no need to replace a physical SIM card, and no risk of losing it or installing it incorrectly. This is especially convenient for travelers unfamiliar with phone settings, preventing accidental SIM removal at the airport or hotel.

SIM Card: Requires Swapping and Possible Manual APN Setup

With a physical SIM card, you must first remove your existing SIM and insert the new one. Depending on the carrier, you may need to manually configure the APN (Access Point Name). Incorrect settings can lead to connection issues, making this option less user-friendly for those unfamiliar with network settings.

🔹 2. Where to Buy: eSIM is Available Online, While SIM Cards May Require In-Store Purchase

eSIM: Purchase Anytime Online and Activate Within Minutes

eSIMs can be purchased online without visiting a store. Simply go to the CDJapan Rental website, select your plan, complete the payment, and receive your QR code within minutes. This is particularly useful for travelers arriving on red-eye flights or late at night when airport stores may be closed.

SIM Card: Airport Purchases May Involve Long Queues or Limited Availability

If you choose a physical SIM card, you can buy one at airport kiosks, convenience stores, or telecom shops. However, there are some downsides:

1. Airport SIM counters often have long lines, especially during peak travel seasons.
2. Some airports may not sell SIM cards or offer limited plans at higher prices.
3. If you arrive after business hours, you may need to wait until the next day to buy a SIM card.

🔹 3. Network Stability & Coverage: eSIM Uses Major Carriers, While SIM Card Coverage Varies

eSIM: Connects to Japan’s Major Telecom Networks with 4G/5G Speeds

Japan eSIMs, such as those from CDJapan Rental, typically use native networks like docomo or SoftBank, ensuring the best coverage and stability. This is especially important for travelers visiting Hokkaido, Okinawa, or mountain and ski resorts, where international SIM cards may have weaker coverage.

SIM Card: Coverage Depends on the Plan and Carrier

Japan offers various SIM card options. Some use docomo or SoftBank networks, providing strong coverage, while others rely on MVNOs (mobile virtual network operators), which may have lower speeds or weaker signal strength. Always check the carrier before purchasing a SIM card to ensure reliable connectivity.

🔹 4. Speed & Data Plans: eSIM Offers Flexible Options, While SIM Cards May Have Limits

eSIM: Choose from 30GB, 50GB, 135GB, or Unlimited Data Plans

eSIM plans vary, and CDJapan Rental offers 30GB, 50GB, 135GB, and unlimited data options, allowing travelers to pick the best fit for their needs.

SIM Card: Many Have Daily Data Limits with Speed Restrictions

Many SIM card plans advertise “unlimited data,” but often come with daily limits (e.g., 1GB/day). Once you exceed this cap, speeds may be throttled to 128kbps, which is barely usable for browsing or streaming.

Which Option is Best for You?

✅ Choose eSIM if you:

• Want fast activation within 5 minutes
• Prefer a hassle-free experience without swapping SIM cards
• Need stable 4G/5G connectivity without speed restrictions
• Arrive on a late-night flight and need immediate internet access

✅ Choose a SIM card if you:

• Have a phone that does not support eSIM
• Prefer using a physical SIM card
• Don’t mind waiting in line at the airport or visiting a store

📌 If you want the fastest and most convenient way to get online, eSIM is the way to go!
👉 Get your CDJapan Rental eSIM now and connect in just 5 minutes 🚀