Bought an iPhone SE from Kings Heath, Birmingham store in July this year for £359 i.e. the full price because I wanted an 'unlocked' phone for an existing SIM. Recently, changed network provider to find that the new SIM wasn't usable. It took a degree of on-line searching to learn that iPhones sold by CPW lock to the service provider of the first SIM inserted. Getting them unlocked must be done by that service provider or a company specialising in that task. This can be a lot of bother and potentially quite expensive (£50-£100). At the time this issue was not communicated by CPW. This problem is not confined to CPW, apparently, so check before you buy!