Item: Ubigi
Rating: 9.3
Author: EsimTao

Question 1

Why is Ubigi considered the #1 best eSIM for Japan?

Accepted Answer

Ubigi is a direct brand of Transatel, which is an NTT DOCOMO subsidiary. Unlike standard roaming eSIMs that route traffic thousands of miles back to overseas gateways, Ubigis Japan data connects directly to Docomo local core network with local breakout routing, providing responsive low-latency performance.

Question 2

Can I keep Ubigi installed on my iPhone permanently?

Accepted Answer

Yes! That is one of Ubigis main advantages. You can keep the Ubigi eSIM installed on your device indefinitely with zero maintenance fee. Whenever you travel to any of 190+ countries, simply open the app, purchase a local pass, and it activates instantly on the same profile.

Question 3

Can Ubigi connected-car vehicle eSIMs and smartphone eSIMs be used interchangeably?

Accepted Answer

Ubigi accounts allow you to manage both connected-car eSIM profiles (e.g. BMW ConnectedDrive, Jaguar Land Rover, Maserati onboard Wi-Fi) and personal smartphone/iPad eSIM profiles under the same Transatel account. However, each eSIM profile has a distinct ICCID tied to that specific hardware device, so you purchase dedicated top-ups for the vehicle or the smartphone respectively.

Question 4

Does Ubigi support direct 5G roaming in Europe and the United States?

Accepted Answer

Yes. In Europe and North America, Ubigi connects to top Tier-1 mobile networks (including T-Mobile in the US, Orange and Bouygues in France, and EE in the UK) with 5G Non-Standalone / Standalone support in covered regions, maintaining low ping times for Zoom and cloud apps.