If you have a jailbroken iPhone, with an unchanged SSH password, there is a high chance that your security can be compromised by any of the iPhone worms out there. The easiest thing one can do to secure his or her jailbroken iPhone is to change the default root password or by disabling SSH entirely. Apple’s spokesperson Natalie Harrison today offered following comments regarding all these recent iPhone worm attacks.
Battery Percentage meter option is officially available on iPhone 3GS only running firmware 3.0 and above; however, there is a small tweak available in Cydia which can enable this functionality natively on the original iPhone and iPhone 3G running firmware 3.0 and above. You will need to have a jailbroken iPhone for this to work.