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Is it possible to have an app that can call a number and tell whether or not it connects? 
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Is it possible to have an app that can call a number and tell whether or not it connects? 

Phone connection

C# is an object-oriented programming language created in conjunction with Microsoft’s .NET framework. Compilation is usually done into the Microsoft Intermediate Language (MSIL), which is then JIT-compiled to native code (and cached) during execution in the Common Language Runtime (CLR).