I'm a little new to this, so you'll have to bear with me. The data used is both sent and received. I have the 2GB plan, because I was worried about only having 200MB a month. As of today, I have 4 days left in my billing cycle. To date, I have used 191 MB of data.
So far as my daily usage, I do the following:
- E-mail (But not much. I receive about 3-5 e-mails a day. Sometimes more.)
- Facebook App (Checked about 10 times a day)
- CNN App (About 5 minutes a day)
- Regular surfing (About 5-7 minutes a day)
I don't do the following unless I am connected to WiFi:
- Watch YouTube videos
- Download apps or e-mail attachments
That's about it. This is my first month owning an iPhone and I must say that I am rather surprised that I am currently sitting under the 200MB mark. I invested in the 2GB plan because I was sure I was going to go over. I think I might stick with the 2GB plan though, as now I know I can use it a lot more! However, if you are limited to a 200MB plan, I wouldn't worry. Just check your data usage by dialing *3282#. This will send a text message to your phone instantly with fairly up-to-date data usage information.
Hope this helps.