here's the problem : installed xp sp3 vs 2010 ultimate monoandroid 4.0.1 installer_r18-windows - android 4.0.3 (API 15) - android 4.0 (API 14) - android 2.2 (API 8) LGDrivers (I think, that is not necessary) after i create the default app (with Button and click) in VS 2010 1. run with no debugger ( I try with both API 14 and API 8 too ) And I get : name.name.apk name.name-Signed.apk 2. adb install -r name.name-Signed.apk i receive a text saying "success" and it works on my emulator BUT when I run this on my LG GT540 currently running 2.3.7 version I get a message saying: application has unexpectedly stopped .. I also tried copying the apk to the phones sdcard and it still didnt work and i also rebooted the phone after instaling the app. what am i doing wrong ? why do i get a double name for my app ? I wont give up from mono for android. Its wonderful and new for me like C# programmer. I only wont to see default mono app running on my mobile device.