I found this on dealmac. You can get 50GB free on AT&T Locker right now, usually new members get 5GB free.
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dealmac.com]
1 Sign up for a free AT&T Locker account
2 verify your email address by clicking through the message you're sent
3 click "My Plan" under Account Settings
4 click "Upgrade Plan"
5 select the 50GB offer
I have added to my collection of free cloud storage.