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Can I still use my SIM Card after installing eSIM?
Yes, you can still use your SIM card after installing the eSIM, in fact you can even use both cards simultaneously, your primary card for calls and message, and the eSIM for Internet.
This is convenient for travelers as it allows them to get a mobile data plan for eSIM from an international provider like Ubigi and avoid roaming charges. 
You can connect anywhere in minutes and keep two lines at the same time. When you return home, you can immediately resume using your primary SIM card.
View here How to switch from eSIM to physical SIM.
How to check eSIM compatibility
How to check carrier unlocking