Businesses in the mobile phones category sell devices for making calls, sending messages and accessing the internet over cellular networks. Stock commonly includes smartphones and, in some shops, basic handsets, along with new, refurbished or pre-owned models. Staff may explain differences in operating systems, screen sizes, storage, cameras and network compatibility, and help customers choose a handset to suit their needs. Many businesses also supply accessories such as cases, screen protectors, chargers, cables, headphones and power banks. Services can include fitting screen protection, transferring contacts and other data, setting up a new phone, and arranging repairs for faults such as cracked screens, damaged charging ports or worn batteries. Some shops sell SIM cards and top-ups, help customers compare mobile network plans, or offer trade-ins and device recycling. The exact range varies: some businesses focus on sales, while others specialise in repairs or accessories.