I have owned this phone for 2 days and need some questions answered. What does the little sign at the top of the phone that looks like an Infinity sign mean? And in the manual it always says 3G on the phone pictures at the top, But in place of that on my phone i have the letter E. Also does it matter what sim card I use? There was a sim card that said 3G that came with it, but I used my old sim card from my motorola Rokr. Help please thank you.