Is iPhone unlocking illegal? (EN)
It is totally legal to unlock an IPhone. Doing so can bring the possibility of much cheaper payment plans both domestically and overseas when travelling. Firstly, operators often choose to lock a phone because they subsidise the handset. If the iPhone is being sold at a lowered price on a contract, they don’t really want you to use their subsidised phone onto another network straight away.
However, when you have been in possession of your iPhone for a particular length of time (generally 30 days or 3 months), you can request your operator to unlock the phone so it can be used on another network. Bear in mind that your network is under absolutely no obligation to unlock the iPhone, but all UK mobile networks will gladly do so if you agree to pay them a nominal unlocking fee, which is usually in the region of £20 maximum.
Beware that some popular methods of unlocking your iPhone may be scams; others may make the handset unusable. Some methods will successfully unlock your phone by “jailbreaking,” but this approach will only work for a short period. Apple periodically updates the software on the iPhone and resolves these loopholes that enable it to be jailbroken. Bringing the software on your phone up to date should return it to the locked state. Your warranty may be invalidated by choosing to unlock your iPhone in an unauthorised fashion. Please do your research very carefully.