The recent iPhone 4S has not yet been unsealed by the teams of hackers. Therefore, neither Cydia and even less SBSettings can be installed on the bike. Tweak with it, multiple options are available quickly. You can enable / disable 3G, Wi-Fi and various other toggles .One of them just called Respring .
A respring is to restart the Springboard of the aircraft without restarting completely. It is often used after installing tweaks to allow their operation. But then, no jailbreak, the task is not feasible. True, it is not necessary. Precisely that is the question: is it a nod to Apple? Not impossible.
To test, change the language of Siri for English (Settings> General> Siri> Language). Now, hold the button for two seconds to bring up HOME Siri. Say "Restart". Hop, that's it.