The custom CRM for the phone store must centralize customer information, sales activity, device inventory, and after-sales service records into a single, intuitive platform that enables staff to quickly access purchase histories, warranty details, financing plans, repair status, and customer interaction logs; the system should allow sales representatives to manage leads, track follow-ups, schedule appointments, and generate invoices or quotations, while also offering automated reminders for contract renewals, payment deadlines, and promotional offers; inventory management must support real-time tracking of phone models, accessories, and SIM cards, including stock levels, serial numbers, IMEI tracking, and low-stock alerts, the CRM should provide role-based access control for sales, technicians, and managers, along with reporting dashboards that display sales performance, technician workload, customer satisfaction metrics, and product trends; the platform must support secure user authentication, data encryption, daily backups, and compliance with relevant privacy regulations, and it should feature a responsive design accessible from desktops, tablets, and mobile devices, with the flexibility to integrate future modules such as loyalty programs, e-commerce syncing, or external accounting systems.