A battle is raging between telecommunications giants and the public is benefiting from it. In response to T-Mobile's "One" unlimited data plan announced in August, Verizon introduced unlimited data plans of their own a couple of weeks ago. This caused a ripple effect as Sprint and AT&T unveiled new unlimited data plans that same week, both of which have their own restrictions and pricing. The battle appears to show no signs of slowing as the carriers are continuing their efforts to win consumers over. Today, AT&T undercut Verizon and T-Mobile with newer unlimited data plans. The "Unlimited Choice" plan is the cheaper of the two new plans, featuring unlimited data at a maximum speed of 3 megabits per second, standard definition, and no mobile hotspot for $60 per month. While it's lower than T-Mobile's $70 plan and Verizon's $80 option, it may not be as generous as T-Mobile's latest promotion. The company just announced a new promotion after AT&T's announcement that offers three unlimited data lines for $100. The Verge reports: In its continuing efforts to attract more sign-ups, T-Mobile's latest promotion offers an additional line for free for accounts with two or more lines. The offer works whether you want to add an extra phone line or a line for wearables or tablets. The deal is available for current and new customers -- the amount of data available to the free line will match up with whatever your current plan is for the other lines. If your plan does not have the same amount of data between devices, the free line will get whatever's the lowest of the bunch. Just two weeks ago, the company updated its T-Mobile One plan to include unlimited data for $100 a month between two lines. CEO John Legere said the free line promotion also applies this new plan. If you are confused about the four carriers' recent announcements, you are not alone. We have included related links below to help you make sense of each carrier's plans.