We have bought a second hand Iphone 6S that is currently locked to Vodafone. The previous owner originally purchased it sim-free from Carphone Warehouse (we have the receipt) but as they do from there, it has locked to the first sim inserted. Vodafone have told me they will unlock it for £19.99 after 30 days use.
My question is after unlocking from Voda will it relock again to the first sim inserted as it was from CPW or will it be permanently unlocked like those direct from Apple?
Thanks in advance.