An eSIM is an electronic SIM card - a tiny circuit board inside your phone that acts like a regular physical SIM card. This virtual SIM card can actually hold multiple SIM cards. The beauty of this is that in addition to your traditional SIM card your carrier supplies you (like ATT, Verizon, T-Mobile) you can now add additional “phone lines” via eSIMs to your cellphone from OTHER carriers. So when it’s time to go and travel overseas just add another carrier who has a far cheaper data rate!
Cost! eSIM plans are a lot cheaper than buying data from your existing cell phone provider. See how much other carriers charge for data here. You’ll be shocked to see what they charge.