Do I get a new phone number with a travel eSIM?

Most travel eSIMs are data-only, so you do not get a new phone number. Your existing number stays on your home SIM, and apps such as WhatsApp and iMessage keep working with your usual number over the eSIM data connection. Some plans include a local number, which is shown in the plan details.

Does an eSIM work without Wi-Fi?

Yes. Once installed, an eSIM connects to mobile networks just like a physical SIM. You only need an internet connection once, during installation, which is why installing on Wi-Fi before departure is recommended. After that, the eSIM provides its own mobile data.

Does an eSIM use more battery than a physical SIM?

No. An eSIM uses the same radio hardware as a physical SIM, so battery use is the same. Keeping two lines active at once can use slightly more power, but that applies to any dual SIM setup, not to eSIM specifically.

An eSIM is at least as secure as a physical SIM. It is built into the device, so it cannot be removed or stolen if your phone is lost, and eSIM profiles are delivered through the GSMA remote provisioning standard used by carriers worldwide.

What are the disadvantages of an eSIM?

The main limits are device support and transfers. You need a compatible, carrier-unlocked phone; moving an eSIM between devices is harder than swapping a plastic card; and many travel eSIM QR codes can only be installed once. Check your device compatibility before buying.

Can I use an eSIM and my physical SIM at the same time?

Yes. On dual SIM phones, both can be active together. A common travel setup is mobile data on the eSIM and calls or texts on your home SIM. Turn off data roaming on the home SIM to avoid roaming charges.

How many eSIMs can one phone store?

Most eSIM phones can store several profiles, with one or two active at the same time. Exact limits vary by model, so you can keep eSIMs for different destinations on the same phone and switch between them in settings.

What happens if I delete my eSIM?

Deleting an eSIM usually removes it permanently. Most travel eSIM profiles cannot be reinstalled after deletion, so keep the eSIM installed until your trip and plan are finished. Contact your provider before deleting if you are unsure.

Do eSIMs work on tablets and smartwatches?

Yes, on cellular models that support eSIM. Many iPads, Android tablets, and cellular smartwatches can use an eSIM for mobile data. Check the specifications of your exact model first, because Wi-Fi-only versions do not support any SIM.

What is a travel eSIM?

A travel eSIM is a prepaid eSIM data plan for a specific destination or region. Unlike a long-term carrier contract, you buy it online before a trip, it typically activates when you first connect at your destination, and it expires at the end of the validity period.

什麼是 eSIM？

ByteSIM eSIM 指南

什麼是eSIM?

一個eSIM，或嵌入式SIM，是內建於您的手機、平板電腦或智慧手錶中的數位SIM。 不需要插入塑膠SIM卡，您只需下載行動運營商配置檔，將其安裝在您的設備上，並在到達時連接到行動網絡。

了解eSIM與實體SIM卡的比較、旅行eSIM的運作方式、如何檢查相容性，以及在購買之前需要知道的事項。

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eSIM 和實體 SIM 卡片在設置、靈活性、通話和簡訊、設備支持以及可持續性方面的比較。
特徵	eSIM 數位	實體 SIM
形式	下載到設備的數位計劃	可拆卸的塑料卡
購買和設置	在線購買，然後掃描 QR 碼或通過應用安裝	在商店購買或等待送貨，然後使用彈出工具插入
切換計劃	在手機設置中保存多個計劃並切換	手動更換卡片
丟失和損壞	沒有鬆動的卡片可丟失或損壞	可能會被放錯地方、彎曲或損壞
雙重 SIM 使用	在使用旅行數據的同時保持你的家庭 SIM 活躍	需要第二個 SIM 插槽或 eSIM
通話和簡訊	大多數旅行 eSIM 只提供數據；保留你的家庭 SIM 用於通話和簡訊	通常包括本地號碼；通話和簡訊取決於計劃
設備支持	需要兼容 eSIM 的解鎖設備	在有 SIM 託盤的手機中運行
可持續性	沒有塑料卡或實體交付	塑料卡和包裝