Telecalling Lead Manager Android App

I need an Android application that lets my telecalling team work efficiently without relying on any external CRM. The core workflow should revolve around three essentials—every call automatically logged, every prospect stored as a lead, and every next step surfaced through clear follow-up reminders... (Budget: ₹1500 - ₹12500 INR, Jobs: Android, Android App Development, Android SDK, Database Management, Mobile App Development, PHP, Software Architecture, User Interface / IA)