I've used a couple of iPhones before and my most recent one I've been having 2 issues...
1. Sometimes when I wake/unlock the phone, i get a blank screen displaying a black screen with only the very top info bar showing. I have to restart to get everything back to normal.
2. Sometimes I would get "NO SIM" where my carrier logo is. I also would have to restart to get everything back to normal.
Any ideas? Anyone else have these problems?