Some international phones who are not in supported countries (where iPhones are sold by Apple) will need to install iWorld in order to prevent their iPhone from crashing. To do this, open Installer, navigate to the category titled "Tweaks (1.1.2)", then install iWorld. Once installed, run iWorld, select your country, and tap "Use This Country".
After you have received the success message, your phone will reboot, applying the new settings. After the reboot, you may uninstall iWorld via Installer.