if you have just two status (1,2) you can do
IIf(Fields.status= 1,"Android","Symbian")
it means:
if(status==1) "Android"
else "Symbian"
or
if there are more than two statuses (like 2,3..) you can insert here another "IIf" function.
IIf(Fields.status= 1,"Android",IIf(Fields.status= 2,"Symbian","unknown"))
it means:
if(status==1) "Android"
else if(status==2) "Symbian"
else "unknown"