What happens after iPhone Erase Data feature?

My iPhone was stolen today and a little after i found it on find my iphone it suddenly said "can no longer track iphone locked or erased" I'm assuming this means they erased my iphone from putting in the wrong passcode 10 times but is it now factory setting? Can they now use it while they couldn't when it had a passcode and my information.

Is 1gb of internet enough for iphone 5?

So I'm getting a iphone 5 and I'm wondering if I should get the unlimited data (but more expensive plan) or 1gb? I'm wondering if 1gb would be enough, I will be downloading apps, using fabook, instagram, whatsapp and twitter (uploading pics) playing games and maybe youtubing a little. So what do you thinks best. I don't really understand kbs, mbs, gbs. Etc.

I locked myself out of my iphone and ipad

I recently changed the password on my iphone and ipad because my little brother figured it out!
i now can't remember the new one and i don't know what to do, is there a ay i can reset my whole phone and ipad? There's nothing on there very valuable so this wouldn't be a problem… Please help!

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?