About the data usage on my iPhone?

I just got the iPhone 5 yesterday, and i have 3GB of data on my AT&T plan, I just want to know if i'm using too much data. My usage in the settings say:

Sent: 3.0MB
Received: 36.5MB

Which one actually counts towards my data usage? The Sent or Received?

It's both. Sent + received = your data usage

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