I don't FTP much on my tablet, but when I do I use ncftp which you can get from the elkins.org repository.

Usually I'm making changes to a variety of files within a collection though, so I mainly use rsync or subversion to keep things up to date. If I'm just moving a couple files here and there, then I use sftp which is part of the ssh package.

Really if you are talking about making updates to collections of php files you should check out rsync or subversion some time though. It's worth the effort.