the limited mobile browser makes it difficult for unknown applications to get on your phone. that said it's still possible but highly unlikely. there are much easier and effective ways to get personal information from someone. Now it is possible to "tap" a cell phone. It happens by basically deciphering the encrypted signal being sent between you and the cell providers switch. normally requires alot of knowledge and equipment. I would only expect this form a government agency. As far as the text messages are concerned providers normal save those and require a subpoena to get them.