I got my iPhone jailbroken in the first 30 minutes after i unboxed it. Many thanks to the clever hackers. But if you have a Symbian mobile phone, you will get more restrictions because those phones are usually locked to protect the user from malware, and there is no such a "jailbreak" way like what we've got for iPhone.
According to F-secure, a talented Spanish modder has developed an easy to use privilege escalation hack for Symbian S60 3rd Edition phones:
"The hack provides unlimited access to the phone's file system. With this access any number of modifications can be made.(...)It makes modding an S60 phone as easy as jailbreaking an iPhone."
That means to run a single SISX installation file on Symbian S60 3rd Edition phones will become more easy with this hack:
"The SISX installation package contains a simple graphical application to remove the access restrictions of any application that is currently running on the device."
But at the moment this hack comes with side effects:
"After escalation the operating system is not able to start any new applications until the phone is rebooted."
Anyway, this is a very good start, we could expect more in the near future.