I need to send my phone off for repair, and I've got an Alcatel A3 XL that I can use as a spare, but it's locked to Tesco. Tesco said they can do it for 10 GBP, but can take up to a week. I've looked about online, and seen various companies offering the service, but not sure which to trust. Is it possible to do it myself, and are there any companies that do it that are legit, cheap and can give me a code quicker than a week? If it comes to it, I'll just pay Tesco, but would rather find a cheaper,