How to determine the phone number using the mobile OS SDK?

Question

Android

How to get phone number data for external app on iOS and Android?
What you need:
1. automatic detection of the mobile phone number (msisdn) of the sim card installed in the device by interacting with the operating system of the device, the device itself and / or the network of the mobile operator;
2. verification of correspondence between the manually entered mobile phone number (msisdn) and the device in which the sim card with this number is installed.
thanks in advance for the replies.