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Carrier 4G LTE Bands Frequencies
AT&T 2, 4, 5, 17 1900, 1700 abcde, 700 bc
First, AT&T. The company has rolled out a massive 4G LTE network in the United States with support for bands 2, 4, 5 and 17, but the backbone of it remains band 17 in the 700MHz range, the company's primary band. The remaining bands 2, 4 and 5 are mostly used in areas where AT&T does not have band 17, while in the densely populated metros, AT&T combines spectrum from multiple bands for better coverage. This is the reason why it is important that your phone supports all and not just one of these bands, in order for you to make maximum use of 4G LTE speeds.
主頻是 700MHz, 但你最好有所有支援的頻道/頻率
Starting in the summer of 2015, AT&T has begun rolling out WCS spectrum in the 2.3GHz frequency range. Those new bands are still only available in limited areas and are considered "capacity layer" on top of AT&T's nationwide 700 MHz coverage. It's worth knowing that only a few phone today support WCS bands: the Galaxy S6 Edge+ and Galaxy Note 5 are two devices that do, but most older phones do not.
Try https://www.cellmapper.net/map
and
https://www.att.com/maps/wireless-coverage.html
二個結果差很多
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下載 OpenSignal APP, 看你附近 tower, 及接到哪一個
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直接到店裡問問
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