Unlocking is needed whenever user wants to change a particular network and it lets user place calls with any GSM carrier by inserting different SIMs into the iPhone. This is useful when traveling abroad, because with the same gadget, you can avoid paying high roaming fees. Jail-breaking refers to accessing system files, because originally these accesses are restricted. Gevey Ultra S is helpful for unlocking iPhone, without jail-breaking and it works with all GSM networks, because it detects the network settings and type upon insertion. This Gevey Ultra S device only works with iOS 5.0 and 5.0.1 and the tool is compatible with GSM iPhone 4S SIMs (CDMA users are excluded).

The kit includes all the necessities for unlocking – an Ultra S SIM card and Gevey SIM tray. The legal consensus is that jail-breaking and unlocking are legal in most countries, U.S. included and they both will void Apple warranty. After jail-breaking there are possibilities for restoring iPhone to the the state before unlocking, but the efficiency varies. So, only unlocking is always better option. Gevey Ultra S works with all 4S models of iPhone – Base-band 1.0.11, 1.0.13 and 1.0.14. Setting it up takes 5 easy steps and it is quite convenient. Previous versions of Gevey unlocking kits showed some problems, so Gevey Ultra S is improved and more useful. There is no need in dialing 112 and this step is replaced with “just one click” unlocking method, the compatibility with cards is improved and network list is significantly broadened.