What's the best online file storage service?

I need to save some files online and I'm looking for free online storage. Need to save from Iphone

Dropbox works very well for this. Free too.

Dropbox is the best(join here- http://db.tt/7mJUU3gz

Features:
Great looking, easy to use and free online storage service
Well designed and simple to use user interface
Edit files in your Dropbox from your mobile phone
Create photo galleries viewable by anyone you choose
Access your files from any web browser through the secure web site
Set up shared folders so you can collaborate online
Share files with family and friends by sending them a link to your Dropbox
Works even when offline and you don't have an internet connection
Uploads just the changes to your files to minimise the bandwidth used
Manually set bandwidth limits to avoid slowing your connection with big uploads
One month history of your files kept - undelete files if you make a mistake
iPad, iPhone, Android and Blackberry mobile apps available
Secure file transfers and data centres
Easily upload photos and videos from your mobile device
Windows, Mac and Linux compatible
Completely free account available
Click here to join- http://db.tt/7mJUU3gz

Like the previous two answers, Dropbox is a great choice.

You get 2GB of free storage, plus a bonus 0.5 GB from using this link: http://db.tt/vWRH8ZL (and I'll admit: I would also get the same amount of bonus space ^.^) By referring others you can continue to earn free bonus space, up to a maximum of 16 GB (on top of the original 2!)

Installing the app on your computer will create a DropBox folder. Any files you drag or save into that folder are automatically synced to your account in the cloud. You can then access those files from any computer with an internet connection by signing into the DropBox website, or on your mobile phone by downloading the free iPhone / Android app!

On your iPhone, the Dropbox app can access your cloud files and you can upload new ones. It's a great way to unload your photos if you aren't near your PC. You can even store music on your Dropbox and then play it in the Dropbox app!

It's fast, easy, secure and reliable. You can't go wrong.