If you are a current AT&T mobile phone user:

 

On August 15^th, AT&T is rolling out a new promotion that will increase your data plan for free. I just got 5 additional GB for the same price as my current plan. I found this out when I added an additional line to my plan.   I was a little surprised that AT&T didn’t notify existing customers about the promotion so I’m passing on the news.   You need to call customer service, or go online to make the change. This offer expires 11/15/2015.

 

Information is contained in the link:

 

http://about.att.com/story/att_introduces_new_mobile_share_value_plan.html