Question 1

eSIMとは何ですか？

Accepted Answer

eSIMはスマートフォンに内蔵されたデジタルSIMカードです。物理カードの代わりにデータプランをダウンロードして即時に有効化できます。店舗に行く必要はありません。

Question 2

私のスマートフォンはeSIM対応ですか？

Accepted Answer

2020年以降の多くのスマートフォン（iPhone XS以降、主要Androidフラッグシップなど）がeSIMに対応しています。設定>モバイル通信でご確認ください。

Question 3

eSIMを使っても自国の番号を維持できますか？

Accepted Answer

はい。物理SIMは通話とSMSで引き続き使用できます。eSIMが海外でのデータ通信を担当します。

Question 4

複数国に対応するeSIMはどれですか？

Accepted Answer

Yesim、Airalo、Nomad、Sailyは複数国をカバーするリージョナルプランを提供しています。

Question 5

eSIMはいつ購入すればよいですか？

Accepted Answer

出発前に購入・インストールして、到着後に有効化できます。出発1〜2日前の購入をおすすめします。

Question 6

ローミングよりお得ですか？

Accepted Answer

ほぼ常にお得です。多くの通信会社は国際ローミングに1日10〜15ドル請求しますが、eSIMプランはその何分の一かで済みます。

Question 7

How do I install an eSIM?

Accepted Answer

After purchase, you receive a QR code by email. On your phone, go to Settings → Mobile/Cellular → Add eSIM (or Add Data Plan) → Scan QR code. The whole process takes under 2 minutes. Some providers also offer app-based installation without a QR code.

Question 8

Can I use an eSIM immediately after landing?

Accepted Answer

Yes — if you set your eSIM to activate on first use, it will connect automatically when you turn off airplane mode after landing. Some plans require manual activation; check your provider's instructions.

Question 9

What happens if I run out of data?

Accepted Answer

Depending on the provider and plan, your data may stop or slow to a very low speed (throttling). Most providers let you top up within their app. Unlimited plans often throttle after a certain threshold rather than cutting off entirely.

Question 10

Are eSIMs cheaper than roaming?

Accepted Answer

Almost always yes. Carrier roaming typically costs $10–15/day. A quality eSIM plan for a week in Europe can cost $10–25 total. The savings are even greater for longer trips — a month of data can cost $15–50 on an eSIM vs $300–450 on roaming.

Question 11

What does price per GB mean and why does it matter?

Accepted Answer

Price per GB tells you how much you're paying for each gigabyte of data. A $20 plan with 10GB costs $2/GB — much better value than a $15 plan with 3GB ($5/GB). We show $/GB on every plan so you can compare value at a glance regardless of plan size.

Question 12

What is an unlimited eSIM plan?

Accepted Answer

Unlimited plans provide unrestricted data, but most have a fair-use threshold — typically 1–5GB of full-speed data, after which speeds are throttled to 1–3 Mbps. This is usually fine for social media and maps but not for video streaming. Read the fine print before buying.

Question 13

Are there free eSIMs?

Accepted Answer

Some providers like Roamless and GigSky offer small free data allowances (100–500MB) as a trial. These are useful for short layovers or to test a provider but not practical for a full trip.

Question 14

Which eSIM covers multiple countries?

Accepted Answer

Regional and global plans from Airalo, Saily, Yesim, Nomad, and eSIMX cover multiple countries under one plan. This is ideal for multi-country trips — you won't need a separate eSIM for each country. Our eSIM Finder can filter for multi-country plans.

Question 15

Do eSIMs support hotspot and tethering?

Accepted Answer

Many do, but not all. Holafly's unlimited plans, for example, do not support hotspot. Saily, Yesim, Nomad, and most data-capped plans do support hotspot. Always check the plan details before buying if hotspot is important to you.

Question 16

Do eSIMs support voice calls and SMS?

Accepted Answer

Most travel eSIMs are data-only. Airalo and Yesim are exceptions — some of their plans include calls and SMS. For calls, most travelers use WhatsApp, FaceTime, or Google Meet over the eSIM data connection.

Question 17

Will my eSIM work in remote areas?

Accepted Answer

Coverage depends on the local networks your eSIM uses. Check which network operators each provider connects to for your destination. In remote areas, providers that partner with the dominant local carrier (e.g. T-Mobile in the US, EE in the UK) will have better coverage.

Question 18

Do eSIMs work on cruise ships?

Accepted Answer

eSIMs work in ports, but cruise ship internet operates via satellite and is separate — your eSIM won't connect at sea. When you dock, your eSIM will reconnect to local networks automatically. For a cruise trip, calculate data needs based on your port stops, not the full duration.

Question 19

How does SimlessTravel make money?

Accepted Answer

We earn affiliate commissions when you click a Get Deal button and complete a purchase. This comes at no extra cost to you — the price you pay is the same whether you go through our link or visit the provider directly. Our rankings are based on objective criteria (price per GB, Trustpilot score, features) and are not influenced by commission rates.

Question 20

Are the prices on this site accurate?

Accepted Answer

We verify prices regularly, but eSIM pricing changes frequently. Always confirm the final price on the provider's website before completing your purchase. We show last verified dates on each plan.

Question 21

How do I get a discount code?

Accepted Answer

Visit our Discount Codes page for the latest verified promo codes for each provider. Some discounts are applied automatically through our affiliate links — no code needed.

eSIMに関するよくある質問

eSIMの基本

購入とセットアップ

価格と価値

通信エリアと機能

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