What is the best cloud storage for photos with the most space?

My iPhone has like 20 gigs taken by pictures and ids. I would like to free all that space up but i don't want to back it up on a hard drive and all that because its inconvenient to hook it up to the comp and all that. So i'm trying to look for a cloud service that i can access from my iPhone that will allow me to upload all my photos and go and view them at any time form the said app. So it needs to have a nice size of free space that i can upload my pics to, and safe (in terms of no one else will be able to see them)

I like using Onedrive

Google Drive gives you 15 GB of storage for free, and then you can upgrade after that. 100 GB plan is $1.99 per month

20 gigs… Lol… Free cloud… Yeah right… Hope you have a really strong internet connection for that massive upload… And I do hope your cloud service never has any problems, since it appears that you care not to make a back up copy onto an external source…