Dropbox, one of the most popular cloud storage services, is now giving you 1GB of additional space for free if you simply connect your Mailbox app account. Once the Mailbox app is installed, go to the Settings menu.
Tap on “Dropbox” and add your account information. If you have the Dropbox app installed on your phone already, simply hit “Allow Access” on the Mailbox app in that section. If you already have the two services linked together, unlink them and reconnect it again. Dropbox acquired Mailbox this past March.
[Download Mailbox from iTunes]