Yes, the best option would probably be to get a local SIM card while in South Africa (like most UK networks that have crazy roaming charges). And if Tesco Mobile customers call the company, it only takes 30 seconds. The Asda phones were unlocked at once, but that was when they were one of the cheaper PAYG networks, and no one who bought a phone from them would go elsewhere . Sims The CarphoneWarehouse is hard to beat, but you have to take care of phones packed with network logos everywhere on the box that the phone comes in because these orange like ZTE Blade San Francisco are locked, locks Orange Even in CPW. Unlock Phone Tool Download. Put puts us on trial All our SIMs come with minutes, texts and MB data so you can test the 4g test at no additional cost. Our standard tariff and 30 day bundles come with 4G for NO extra c cheese, giving you faster internet speeds.