I had this problem and called Apple, they told me its a blip and nothing can be done, the only hope is if you've backed up your contacts to your PC.
The other hope is if you go to settings, mail, contacts, calendar and click on Import Sim Contacts, these will probably be the ones you loaded on when you got your phone.
Gigondas
The Cisco 4507 can be upgraded using the regular method for upgrading the software image on these kind of devices. Cisco provides a manual and information for how it can be upgraded.
Firmware
No.
If its on 3.1.3 then use "Spirit" to jailbreak it
Spencer just recently changed phones. She had the HTC hd2 but upgraded to the hd7.
go and find out yourself
Well, it's obvious - upgraded software works better. In fact there are some apps that must have been updated like anti virus software.
It has, and it recently upgraded again to Jelly Bean (4.1.2).
There is no utility as such. There are several different methods by which software is installed and upgraded, depending on the distro.
Steam company by using the Source engine. Which is upgraded from Condition Zero software they used.
It was upgraded and replaced and then so was it's replacement over 5 years ago