We activate our Infopath form for mobile devices.We add secondary data connection(MSSQL or Sharepoint list) to our form,we are taking data but when we want to process data, we take "unknown error" on our sharepoint page.(From A db, we take customers.We can choose between one of them but when we click on send or update button we take "unknown error")(all tested web browser and mobile browsers - internet explorer , windows mobile 6.0 , windows mobile 6.5 , blackberry browser)