Android Question call forwarding

Hi

I try to make a small app to forward all my GSM call to my house. I use the phonecalls function to do this but it doesnt work.

here is my code :

Dim p As PhoneCalls
Dim my_forward As String

my_forward="*21*" & txt_numero.text 'where there is my house number
StartActivity(p.Call(my_forward))

Click to expand...

When i run my app the phone dial *21*0123456789 where 0123456789 is my house number but nothing happend. I 've not the icon on the upper left saying the the forwrd is active.

When i dial manualy on my gsm keyboard evrything works find ....

Do you have any idea what wrong

thanks for your help