Can I use WhatsApp with my Gigago eSIM?

Yes, you can use WhatsAppp with your eSIM plan like normal.
When setting up your eSIM, you can keep your WhatsApp number, and all conversations as well as contacts.
It is no need to worry about being lost of contact while traveling abroad. However, remember that making video calls with WhatsApp uses up a lot of data. Instead you had better send message whenever possible.