What Is data roaming and how does It work?

How much data does Whatsapp use?

How much data does iMessage use?

How much data does Instagram use and how to reduce it?

How much data does YouTube use and how to reduce it?

How to set up an eSIM on your Apple Watch?

What smartwatches are compatible with eSIM? 

What is an SM-DP+ address? And how to use it to activate an eSIM?

How many eSIMs can you have on your phone ?