Mobile App Development with Flutter

The DIALER app should be user-friendly and efficient, with features such as call logs, contact lists, and the ability to make and receive calls with Sim1, Sim2 and via WhatsApp. During mobile number dialling, the number shall be verified with whatsapp availability and enables the whataspp dialer accordingly. Need app in FLUTTER which is suitable for Android and IOS.
Main features required:
1. Sim cards detection and enabling of dial pad with respective sims and whatsApp.
2. For dialling: Sim1, Sim2 and whatsApp
3. For call receiving: sim1 and sim2. Understanding whatsapp call receiving is available in whatsApp only.
4. Contact search bar with name or number or place.
5. About us and feedback page required.
6. Call features in Sim1 and sim2 are call hold, call merge upto 3numbers, mute and dial pad for ivs.
7. Able to select country code whole dialling. Default is India.
8. Display off during ongoing call when phone is near ear.
9. Reading and displaying of call logs and history.
10. Reading of contacts from contacts app
11. During number dialling, checking the number availability in whatsapp and enabling the whatsapp dialling feature.
12. Visibility of photo or name during call.
13. App deployment in app and source code required.
14. Google Ads integration and app deployement in app stores.

Price breakup required as following:
1. Only overall project cost to be quoted(Hourly basis is not acceptable) or total no.of hours to be quoted for the project
2. 1 year warranty services for errors and crash with 24 to 48hours response time.

Reference apps are phone, simple dialer, easy phone, right dialer, phone dialer, phone dialer &caller id and many more…

Please include links to past completed projects, especially those related to dialer apps.