More and more data storage will take up much space of your i Phone, such as photos, videos, text messages, etc.
When you find the delay time is longer when you launch Camera, Contacts, or other applications, you may need to restore the device.
You can jailbreak i Phone 3.1.3 by creating Custom firmware IPSW file using Pwnage Tool 3.1.5.
Launch i Tunes as your i Phone has been previously unlocked, and it will reapply the unlock code and let you to use again the other networks.
You would know by now that apple has pushed i Phone firmware update: i Phone OS 3.1.3 for i Phone and i Pod Touches.
Almost all the Jailbreak tools like Red Sn0w, Pwnage Tool and Sn0wbreeze has also been updated to jailbreak i Phone OS 3.1.3 but Geo Hot is showing to interest in updating Black Ra1n and Black Sn0w to jailbreak and unlock i Phone firmware 3.1.3.
Back up your i Phone data This step is of great importance. But if you don't want to lose any significant data file on your i Phone, such as contacts, text messages, photos, videos and so on, we suggest you'd better back up i Phone data first.
Though i Tunes can help you to do that, from the first part, we may know that it seems not very secure to restore your i Phone with i Tunes.