Orange will unlock your iPhone for a fee of £20 providing you’ve had it for at least 3 months. The unlocking process takes between 7-10 days to complete.
According to Orange:
If it’s a pay monthly phone you’ll need to call 150 free from your handset, or 07973 100 150 from a landline (call charges may vary).
If it’s a pay as you go phone you’ll need to call 450 from your handset, or 07973 100 450 from a landline (call charges may vary).
Many readers have experienced difficulties in unlocking an iPhone from Orange (see comments below) although there are some success stories too. Please do share your experiences in the comments below too!