Alcatel Idol 4S comes with a 5.5-inch Full HD AMOLED display protected by Dragontrail Glass, a 21MP rear camera, and an 8MP front camera. It is powered by a quad-core Qualcomm Snapdragon 820 clocked at 2.15GHz, 4GB of RAM, 64GB of internal storage (with microSD support), and a 3000mAh battery.
It supports bands GSM network: 850/900/1800/1900, UMTS 2/4/5, LTE2/4/12. AT&T 4G HSPA and HSPA+ use 850Mhz(Band 5) and 1900Mhz(Band 2) bands and AT&T LTE uses Band 17(700Mhz), Band 5(850Mhz), Band 2(1900Mhz), Band 4(1700/2100Mhz) currently, so the device should be compatible, depending on the area.
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While it does not make much sense to invest in a Windows Phone now, the knock-down price makes the deal irresistible if you were already steeped in the ecosystem and looking to replace your existing device in any case, or simply wanted to give a cheap smartphone to someone without a great need for apps.