If your iPhone is locked to a particular carrier, then it’s very difficult if you want to use any other SIM card on it. But all the iPhones are not locked that Apple sells in the UK, mostly the iPhones that are sold by carriers are locked to their network. You can unlock your iPhone by your phone provider if the contract is over. However, if the contract is still valid, then the process will be considered illegal, and it is tough to unlock. You will get to know that your iPhone is locked to a particular carrier when you insert a SIM and won’t be able to make any call from that.
Here I am providing a list of carriers in the UK and how to unlock an iPhone by them.
Process To Unlock An iPhone
O2: You need to fill up an online form to unlock your iPhone.
Virgin Mobile: If you want to unlock the iPhone, then make a call to 780 from your iPhone, and 03456000789 is the number if you want to call from other numbers.
TESCO: TESCO requires you to complete the contract of 12 months before you unlock the iPhone. If you have completed the period, then call to 08000321320, and you will be provided with a code to unlock your iPhone.
EE (T-Mobile and orange): EE needs you to complete a period of six months, and you have to clear all the bills till the date. Also, you will be charged a fee of 20.42 pound. If you agree with this, then fill up an online form to unlock an iPhone. Then your iPhone will be unlocked in 20 days.
Vodafone: Vodafone also will cost you 19.99 pound to unlock the phone. You need to fill up an online form, and they take 10 days to complete the process and unlock the phone.
Once your phone is unlocked, insert a SIM and do the required updates to activate it.