You need to mention in your country name and cellular operator name for accurate help.
You can contact your nearest Mobile shop to unlock your mobile for "instant unlocking". You can also request your operator to provide you with Unlock code. Cellular operators might provide code when your contract period with them is accomplished. But, since usually operators might not easily give unlock codes and sometimes even Mobile shops aren't available, You can buy the unlock code from online websites.
Unlock it now, offers Unlocking Sony Ericsson S500i with different options. You can visit there and choose any of the options you find convenient.
You can contact your nearest Mobile shop to unlock your mobile for "instant unlocking". You can also request your operator to provide you with Unlock code. Cellular operators might provide code when your contract period with them is accomplished. But, since usually operators might not easily give unlock codes and sometimes even Mobile shops aren't available, You can buy the unlock code from online websites.
Unlock it now, offers Unlocking Sony Ericsson S500i with different options. You can visit there and choose any of the options you find convenient.