ios - App reads my Apple ID -

i interested know, can app read apple id?

here issue: have outsourced app company. app social networking app: create profile , insert few profile details: name, age, gender. not relay on phone numbers whats app, email addresses or facebook profiles.

the app live in app store , have ipad , iphone registered on same apple id. have downloaded app on phone , created profile. have downloaded on ipad , seeing same profile created on phone.

i've have tried other apps use similar logic, no phone numbers, emails or fb profiles (whisper app being 1 of them) , can create 2 different profiles 1 on phone , other on ipad. wondering if problem surfaces because there in code makes app read apple id.

i appreciate help

apple doesn't provide api allowing application read information user's apple id. helps protect identity of user, don't want any third-party app reading information apple id.