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When my App prepared in Delphi Seattle will be downloaded by that mobile user how can I pick the Sim Card number ? <br />
This I need for Registering him if he agrees.
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When my App prepared in Delphi Seattle will be downloaded by that mobile user how can I pick the Sim Card number ? 
This I need for Registering him if he agrees.

SIM number for APK using Delphi 10

Delphi is the most powerful Object Pascal IDE and component library for cross-platform Native App Development with flexible Cloud services and broad IoT connectivity. It provides powerful VCL controls for Windows 10 and enables FMX development for Windows, Mac and Mobile. Delphi is your choice for ultrafast Enterprise Strong Development™. Look for increased memory for large projects, extended multi-monitor support, improved Object Inspector and much more. Delphi is 5x faster for development and deployment across multiple desktop, mobile, cloud and database platforms including 32-bit and 64-bit Windows 10.

Delphi

Smartphones run using a variety of operating systems -- Android, iOS and Windows Mobile most commonly -- and an even wider variety of programming languages, including Objective-C, Java, Visual C#, C++ and .NET, not to mention HTML5 and JavaScript, and cross-platform frameworks such as PhoneGap.