Essentialy you get a free phone for the price of a month.If you dont activate it's possible to get it unlocked given you have use for the refill.
Also popular cb site offers a discount for buying it.YMMV
Last popular deal was the same.Wanted to inform people about the current offer since it was not posted.
GoPhone Prepaid Plan Info
$30 Plan: Unlimited Talk & Text (no data)
New GoPhones qualify for free unlock via AT&T's Device Unlock Portal https://www.att.com/deviceunlock/#/
Ends 4/6/17. While supplies last. Phone restricted to GoPhone service during first six months after activation and cannot be used with any other carrier's service. Avail. online and at participating AT&T stores. Elig. GoPhones: ZTE Maven 2 only for free offer. $20 off select GoPhone smartphones: Samsung Galaxy Express 3, Samsung Galaxy Express Prime, LG Phoenix 2, or Apple iPhone 5s Bundle ($45 of service included-no addl payment for service required). Svc: Req's new line of service. Req's min. $30 payment for service at time of sale. Taxes on purchased phone & plan payments extra. Limit: 3 per customer, not valid with other offers. Restocking fee: Up to $45; must return w/in 14 days. See store for details. GEN. TERMS: By activating or using GoPhone svc, you agree to be bound by Terms of Service & Plan Terms avail. at att.com/gophoneterms. Svc cannot be resold or used for fraudulent purposes. Geographic, usage, & other restr's apply. Svc provided by AT&T Mobility.