Unlimited data plans are becoming a trend in all carriers now. Last week, AT&T announced unlimited plans for its post-paid customers with its GoPhone brand for $60/month and 6 GB for $40/month with AutoPay.

"We're excited to offer a truly unlimited plan for our AT&T GoPhone customers," AT&T Vice President Bob Bickerstaff said in the announcement. As written in Ars Technica, new offerings limit video quality to standard definition, caps overall speeds at 3 Mbps and prohibit mobile hotspot.

New plan costs $65/month for customers who don't sign up for AutoPay. It is identical to AT&T's recent post-paid plan but post-paid customers have the option of paying $90/month without a speed limit. Users also get 10 GB high-speed tethering data and HD video streaming in the post-paid plan.

As reported by Android Authority, the carrier will temporarily slow data on a line during a planning cycle after 22 GB of usage during periods of network congestion. It is not better compared to T-Mobile's offer that provides high speed up to 30 GB but better than its previous $60 plan which offered 8 GB data limit.

There is another plan for AT&T prepaid users with low usage that does not limit speed to 3 Mbps. Users can get 6 GB data for $40/month with AutoPay and $45/pay without automatic payment. There are no overage fees after 6 GB usage but the data speed will be reduced to 128 kbps. This plan also supports HD video streaming but it is limited to 1.5 Mbps by default to save the data.

AT&T plans are perfect for people who travel to Canada and Mexico frequently as it offers unlimited calling, texting and data usage there as well. There is a Multi-Line discount to add family members in every GoPhone plan and one can save up $600 a year. Customers who want to buy a phone to go along with any plan, there is a $20 discount on Samsung Galaxy Express 3 and LG Phoenix 2 for a limited time.