AT&T mobile hotspot phones are growing at a quick pace at AT&T , as the second largest US carrier, like other providers aggressively markets the lucrative data plans . On March 2011 AT&T allowed its iPhone users to tether their smartphones with up to three devices . AT&T mobile hotspot on iPhone unfortunately only works on iPhone 4 and iPhone 3Gs phones running on the latest Apple iOS (iOS ver 4.3).
Currently there’re at least four AT&T mobile hotspot smartphones customers can purchase with a two-year agreement. Several smartphones such as Samsung Infuse and HTC Inspire come with built-in tethering feature while select smartphones needs an app to acquire mobile hotspot capability like other mobile hotspot devices.
AT&T mobile hotspot phones and Data Plan
Data Plan
Currently AT&T customers are able to tether their phones which requires separate subscriptions costing $20 a month. The extra cost is on top of AT&T Data Pro plan of $25 per month, thus, in order to use AT&T mobile hotspot feature on their smartphones users need to spend $45 per month. In case users go over their quota cap they can buy additional data for $10 per GB. AT&T mobile hotspot subscription for use on a smartphone is slightly cheaper than that of using a dedicated AT&T mobile hotspot device such as AT&T Mifi 2372 mobile hotspot and AT&T Mobile Hotspot Elevate 4G which cost $50 per month for 5 GB of data and $10 per 1GB in overage data use.
AT&T mobile hotspot phones Line Up
HTC Inspire, Samsung Infuse, Samsung Captivate, Pantech Crossover are among AT&T mobile hotspot phones currently available for those who want to turn their phones into a Wi-Fi hotspot. Several of them run on Android 2.2 platform (Froyo) and some on the Gingerbread (Android 2.3) and do not need additional app to make them mobile hotspot phones. HTC Inspire is the first 4G smartphone to land at AT&T and the first to feature mobile hotspot capability.
HTC Inspire
HTC Inspire sports a sleek design and comes with an 8-megapixel camera , dual LED flash, in-camera editing, live picture effects, and a 720p camcorder to record high definition. It has 16M color TFT display which offers images with enhanced 480×800 pixels as well as a 4.3-inch class touch screen panel with HTC Sense User Interface (UI) and multi-touch input support.

HTC Insipire :( Imaga Credit : HTC, AT&T)
The Inspire runs on the powerful 1Ghz Snapdragon processor and is powered by Android 2.2 (Froyo) . Recently HTC launched an OS upgrade, enabling HTC Inspire users to upgrade the smartphone OS to the latest Android platform (Gingerbread)
Samsung Infuse 4G
Like HTC Inspire Samsung Infuse 4G is an Android smartphone and is among ther first AT&T 4G smartphones with mobile hotspot capability . The Infuse runs on a 1.2 GHz Hummingbird processor, other features include 8–16 GB internal Flash memory, a 4.5 inch 480×800 pixel Super AMOLED Plus capacitive touchscreen display, a 8-megapixel camera and a 1.3 megapixel front-facing camera.

Samsung Infuse (Image Credit: AT&T ,Samsung)
Customers who bought a 2011-released Android phone including the Infuse 4G, is eligible to update their OS to latest Android operating system (Gingerbread). Either AT&T will roll out the update to the phone over-the-air (possibly via Wi-Fi) or the user may need to download the update to a computer and connect the phone to the computer to install the new OS.
Samsung Captivate
Touted as one of the best alternatives to iPhone 4 by PCmag.com the Captivate measures 4.18 x 2.5 x 0.39 inches (HWD) and weighs 4.5 ounces, it’s slim yet averaged-size. The Samsung Captivate sports a bright Super AMOLED screen, running on a 1GHz processor, 16GB of onboard memory. The phone delivers superb call quality, full wireless options, and a High definition video capture.
Samsung Captivate 4G (Image Credit: AT&T ,Samsung)
The Captivate offers one-stop your social media services, messages, personal and business e-mail, calendars and contacts. It is designed around Messaging and Contacts, both of which initiate the sending and receiving of information–whether it is e-mail, instant messaging, social network updates or SMS messages. Moreover, calendar information from portal calendars, including Google Calendar, and social media services are shown together in a single calendar with two-way synchronization.
Pantech Crossover
Crossover is the first Android phone released by Pantech. The phone runs ona 600MHz processor, features a full slide-out QWERTY keyboard, a 3.1-inch touchscreen display, support for 802.11 b/g/n Wi-Fi networks, a 2GB microSD card, a 3-megapixel camera, and a 1,500 mAh battery good for up to five hours of use.

Pantech Crossover (image credit : AT&T)
It might not deliver the best specifications, however , it does come with an reasonably priced option. The phone sells for $49,9 with a two-year contract and is currently one of four AT&T mobile hotspot phones.