Connect your iPhone to your Mac and open iPhoto. Import all your iPhone photos to a new folder in the software (I labelled mine "iPhone 4S"). Select all the photos within that folder.
Select File > Export. Under "Size," click "Custom." A drop-down box will appear. Choose the reduced file size you would like to apply to each photo.
Select "Export" and save to a file you have created on your computer. I labeled mine "iPhone photos."
A bar will appear indicating export progress.
After you've successfully exported your photos to a file on your computer, head to Flickr.
On the top task bar, you'll find an option labelled "Upload." Click it.
Note: Before uploading photos that have been on your iPhone, consider whether you want to adjust your privacy settings. You may want to keep your Photostream or certain sets private.
Once you've selected which photos to upload (maximum 200 photos per batch), you can watch them load.
Click the blue "Upload 200 photos" button on the upper-right of the screen. This will port the photos to your Flickr Photostream.
A progress bar indicates how long you have to wait. When the upload has finished, Flickr will automatically navigate you back to Photostream to peruse your new collection.
When preparing to upgrade to a new phone or tablet, you might have some housecleaning to do. How do you go about saving the data and memories from a device you've operated for months or years?
If you choose to save your iPhone photos to the cloud, you have several options. iCloud is a great plan, but it only offers 5GB of free cloud storage. If you're like me, your phone contains 14.2 GB of photos and video (some photos are between 2 and 3MB each — so iCloud won't cover all of your data. You may prefer Dropbox, but again, the service only offers an initial 2GB of free space before you need to pay for upgrades. You might even consider Evernote, but it's not the greatest choice for bulk uploads and it only offers 60MB of free storage per month.
See also: 16 Best Free Mac Apps
Personally, my choice was Flickr, which offers users 1 TB (that's terabyte) of free media storage. For context, I have uploaded 798 photos to Flickr (around 800 pixels wide each) and I've only breached 0.05% of my Flickr maximum storage.
Depending how many iOS photos you want to save to the cloud, you may consider compressing that media to squeeze in below those cloud storage maximums — or to make uploading quicker. To learn how, follow our walkthrough in the gallery above.
The second half of the gallery is a bonus. If you choose to upload your newly compressed iPhone photos to Flickr, follow this walkthrough. Note: You can also upload to Flickr straight from iPhoto, but without compressing, the process takes much longer.
Image: Flickr, Paulo Ordoveza