What does Iphone mean when it says 250MB sent and 1.7GB received?

I need a detailed explanation-im not good at this stuff…

It means exactly what it sounds like. You've sent 250MB of data and received (downloaded) 1.7GB.

1GB = 1024MB so close to 2GB altogether. If you're counting your data usage then you add it together.

That's the data you've used in using the internet.

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