Flutter App Enhancement for Carrier Data

I'm looking for a developer who can enhance my Flutter-based app to fetch specific carrier information. The required data includes the carrier name, RSRP and RSRQ parameters, VOLTE status, and more.

Key Requirements:
Code for app to retrieve the following information:
-Fetch phone number from Sim
-mobile network operator (getSimOperatorName)
-if VOLTE is enabled and registered
-If data roaming is enabled
-If device is in roaming
-4G RSRP & RSRQ
-If device is Wifi connected and Wifi SSD
-Current location

Need to be able to:
-Progamatically change mobile network operator

Ideal Skills:
- Proficiency in Flutter
- Experience with iOS and Android app development
- Familiarity with fetching carrier-specific information

Please ensure your proposal reflects relevant experience and includes a timeline for delivery.