Two main odometers flank the left and right side, a center strip provides you with miscellaneous details, while two smaller meters sit above that detail how much charge is in the battery and an estimate of how many miles of range you've got left.
If you ever experience this on your Phone 4, avoid gripping it in the lower left corner in a way that covers both sides of the black strip in the metal band, or simply use one of many available cases.