DJB Help Desk
An eSIM is a SIM card that is embedded in a mobile device and can connect you to any operator offering eSIM services.
For further details： https://djbcard.com/esim-sim-compare/
The only difference between eSIM and physical SIM card is the way to activate the plan. The other things such as network speed, reception, and quality are all the same.
Sorry, it can’t be. An eSIM can only be installed on one device, and it cannot be activate or download on other devices after it is used.
First, please make sure that “Cellular Data” and “Data Roaming” are turned on, and “Cellular Data” is correct switched to eSIM plan. If you still cannot connect, you can reset the APN and reboot the phone.
Since many airports may set some equipment up to filter signals, the internet speed inside the airport may be unstable or slow, so it is recommended to try again after leaving the airport.
If you have completed all the settings on your iPhone but still can’t access the Internet, you can try resetting the network settings.
Reset Route：「Settings」-「General」-「Transfer or Reset iPhone」-「Reset」 – 「Reset Network Settings」
Resetting network settings only affects the network settings, it will not change or remove the phone settings.
Fair Usage Policy (FUP)：In order to maintain the quality of the network, operators will impose restrictions on heavy users, you may feel slowed down or unstable on the connection. All the telecommunication companies worldwide have the policy to prevent the abuse of network resources.
The reduced speed network can still be used, but basically you can only send text messages and browse text pages. If you need to send audio, photo, and video or watch movie or clip, it will take more time to load.