Android Question Caller phone number retrieval

[Puiu]

Hello everyone!
I want to make an application to be installed on a phone from the reception of a company. The application must run in the background. When a phone call is received, identify the caller's phone number and then send it through a connection (I haven't decided how yet!) to a tablet containing the management application for automatic customer identification . Can such an application be made for Android? I know that in newer versions of Android, access to resources has been increasingly limited...
Thank you!

 

[Puiu]

in the meantime I managed to get the caller's phone number!
Now step 2: which method is the most recommended for transferring the phone number to another device running Android? I am interested in making the connection of the 2 devices as simple as possible for the user. Is bluetooth ok? The information transferred is not critical, but I would still like the communication to be as secure as possible...

 

[Alex_197]

in the meantime I managed to get the caller's phone number!
Now step 2: which method is the most recommended for transferring the phone number to another device running Android? I am interested in making the connection of the 2 devices as simple as possible for the user. Is bluetooth ok? The information transferred is not critical, but I would still like the communication to be as secure as possible...

You cam encrypt the phone number string and then send it either via BT or as FCM