So, if you want to take advantage of deals and promotions from other operators, you need to unlock it. My daughter had a mobile phone on a Vodafone pay-as-you-go (PAYG) deal. After a year wanted to switch networks to take advantage of a £1-a-month contract deal with another provider. When I rang Vodafone it all sounded very easy and fee-free. But further along the call centre chain I was told this would incur a £19.99 charge - a big fee considering you can get phones unlocked at high street outlets from around £5.