You want to change networks, but your new SIM card won't work in your iPhone. Baffled, you call the new network, only to learn that your iPhone is locked to the first network, and there's not much you can do about it.
Of course, this isn't strictly true. If you're using an iOS device (we've already covered SIM card unlocking for Android device), there's always something you can do.
If you bought your iPhone direct from Apple, you've got an unlocked phone that's good for use with any carrier. But what if you bought it second-hand, through a network provider or on a contract?
There's a good chance your carrier wants to limit what you can do with the hardware they have supplied you, and that means keeping you as a customer by simply denying access to other networks. Don't stand for this tel-co nonsense – take the power back.
What that means for you and me is that the carrier must authorize the unlock, which prompts Apple to then add the IMEI number to the official unlocked iPhone database. The difficulty in getting your iPhone unlocked differs massively depending on where you live, and who your carrier is. Providers like O2 and Orange in the UK are notorious for creating their own unlock policies, and making it as difficult as possible for users to unlock their iPhones.
It's also a bad idea to keep outdated software on your device for the sole purpose of maintaining your jailbreak – you're leaving yourself vulnerable to security threats (like the TLS vulnerability addressed in iOS 7.1.1). Major software updates won't be jailbroken for weeks, usually months. Even if you do update and manage to downgrade successfully, permanent baseband upgrades applied with every iOS update mean you won't be able to unlock thereafter anyway.
what about Gevey SIM Hack?
As soon as iPhone Dev-Team failed to produce Ultrasn0w unlock for iPhone 4 2.10.04, 3.10.01 baseband, a Chinese hacker team called Gevey started to look into the issue and found a working solution which can actually unlock iPhones on said the basebands. Before I may go into pros and cons of Gevey's iPhone unlock, I would like to clarify what is Gevey SIM hack and how it works to unlock your iPhone.
With Gevey SIM hack, you can unlock iPhones on 01.59.00, 02.10.04 & 03.10.01 basebands. Unlike Ultrasn0w unlock, Gevey SIM hack is not a software based hack as it requires you to buy a SIM interposer which sits electrically between the SIM card and baseband hardware to perform a classical MITM. In order to stay unlocked, you ALWAYS need to keep that SIM interposer in-between your SIM card and iPhone baseband hardware.
While your iPhone is unlocked with Gevey's SIM interposer, if it loses power due to low battery or loses reception due to poor signal coverage, you have to perform the whole unlock procedure again.
So How Gevey SIM Interposer Works to Unlock iPhone?
Although SIM card holds many different types of information but the part which involves carrier unlock is the IMSI number. IMSI (International Mobile Subscriber Identity) is a unique number that corresponds to your account in the mobile carrier's database. Every IMSI number consists of a MCC (Mobile Country Code) and MNC (Mobile Network Code).
The above IMSI indicates the SIM is from Canada (302) Rogers Wireless (720). When there was no software unlock available, the iPhone baseband versions used to check IMSI twice following a restart but later Apple made the authentication procedure mode difficult to crack by introducing a 4-byte TMSI (Temporary Mobile Subscriber Identity) which now identify each handset before IMSI is sent and processed.
So how Gevey SIM still manages to trick the TMSI? It actually makes use of the emergency numbers such as 112 to get the TMSI for your connection. When the network issues TMSI for your connection, Gevey's SIM interposer finds an acceptable MCC/MNC combination by rapidly cycling a list of IMSI. To prevent your baseband from detecting the fake IMSI, toggling the flight mode for a second is enough. This spoofing of IMSI and ICCID makes your carrier think that your iPhone is factory unlocked.
Without any doubt, spoofing of IMSI and ICCID using a legitimate emergency number is unethical or downright illegal. Also keep in mind that your network can request your IMEI during the emergency call and can ban your account for using false information and tampering with your SIM card.
1. It works if your network handles emergency numbers such as 112 calls properly according to the GSM standard. So before buying Gevey SIM, first step is to dial emergency numbers such as 112 from your phone and check the response.
2. If your network validates your IMSI on every incoming call, do not think of buying Gevey SIM.
3. Even if your network do not validates your IMSI on every incoming call, you still have to revalidate your IMSI if your iPhone loses power, loses the reception or move to another PLMN. In all of these cases, your TMSI expires and has to be obtained again.
4. Not all 3G or 4G network will work, poor network signal is a common problem.
5. SIM interposer will not harm your iPhone hardware but it can get your account banned from your network provider if they knew that you have spoofed your IMSI and ICCID.
6. You can just update to the latest iOS version. Doing so will lock your iPhone again and your gevey sim won't work. Why? because the Gevey you have was specifically made for the current iOS (to earlier version) and baseband of your phone. If you accidentally upgraded your iphone, you will have to wait for the latest version of gevey sim that will work for the latest iOS.
7. For earlier versions of gevey sim, hassle in going all through the Gevey steps whenever you reboot your phone (like dialing 112, airplane mode.. etc. ).
This is how it goes in the jailbreak and SIM Hack world – things move and change so quickly that one set of instructions quickly becomes redundant in the constant game of cat and mouse.
Would you like to use your iPhone on a different network provider? Unlocking your iPhone releases you from your initial provider, giving you the freedom to choose! iPhone contains a SIM card, this chip allows your network provider to identify it by the serial number or IMEI it contains. This also enables the network provider to "lock" your phone to their network.
Any attempts to use a "non-approved" SIM card in an iPhone which is locked to another network fails. That's where *EUG (Eggbone Unlocking Group) comes in. If you would like to use your iPhone on the network of your choice, then you've come to the right place!
These details are used by us to unlock your device. Once unlocked , we will notify you, providing instructions on how to complete the unlock. When completed, you will be free to choose a new network provider.
Even if you decide to remain with your initial network provider, unlocking your iPhone gives you the freedom to take it with you for international travel, if desired.
Note: Price of factory unlocking iPhone depends on the iPhone model and the carrier / network the iPhone is locked to. Contact us for the price of the factory unlocking of your iPhone, you can pay through PayPal, Bitcoin, perfectmoney or MTN mobile money.