For hosting common files it's ok. Also it is on Android too do, great to transfer files between your Windows and your phone. But if you want better security you have to subscribe a monthly offer.
Dropbox - Online Sync and File Sharing
3uTools - 3uTools is a most efficient iOS file and data management tool for Apple users.
Google Drive - Access and sync your files anywhere
iSHSHit - iSHSHit allows you to backup your SHSH blobs from Apple directly on your iDevice for later...
Mega - Secure File Storage and collaboration
Blackra1n - (This is an OUTDATED jailbreaking method.)