Cross-Platform After-Sales Service App

I need a mobile app for both iOS and Android. The app will support after-sales service for our Coolwind home appliances, like air coolers.

Key Features:
- Product Registration
- Service Request Submission
- Service Tracking

User Authentication:
- Phone number OTP

Ideal skills and experience:
- Mobile app development for both iOS and Android
- Experience with OTP authentication
- Familiarity with service request and tracking systems
- UI/UX design skills for a user-friendly experience