It looks like HTC One max will also be on AT&T, according to GSMArena, who got a press photo of the phone courtesy of @evleaks.  Initially, Sprint and Verizon Wireless were the only US carriers to carry the HTC One max in the United States. Therefore, the appearance of the phablet in AT&T livery surely caught us by surprise.

HTC One Max will get the latest Android release, coupled with the most up-to-date edition of HTC's proprietary Sense UI. 

HTC One Max Features:

• Quad-band GSM/GPRS/EDGE support; 3G with HSPA; LTE
• 5.9" 16M-color 1080p Super LCD3 capacitive touchscreen with 373ppi pixel density
• Android OS v4.3 Jelly Bean with Sense UI 5.5
• Quad-core 1.7 GHz Krait 300 CPU, 2 GB RAM, Adreno 320 GPU; Qualcomm Snapdragon 600 chipset
• 4 MP autofocus "UltraPixel" camera with 1/3" sensor size, 2µm pixel size; LED flash
• 1080p video recording @ 30fps with HDR mode, continuous autofocus and stereo sound
• HTC Zoe
• 2.1 MP front-facing camera, 1080p video recording
• Wi-Fi a/b/g/n, Wi-Fi Direct and DLNA; Wireless TV-out (Miracast)
• GPS with A-GPS, GLONASS
• 16GB/32GB of built-in storage, expandable via a microSD slot
• MHL-enabled microUSB port
• Bluetooth v4.0
• NFC
• Standard 3.5 mm audio jack
• Accelerometer and proximity sensor
• Active noise cancellation with dedicated mic
• Sleek aluminum body
• Front-mounted stereo speakers with BoomSound tech
• Class-leading audio output

Source: twitter