The AT&T iPhone 6 will work on Sprint and Verizon, but it's incompatible with their 3G networks. That means in the absence of a LTE signal your phone won't have a network to fall back to, and you won't be able to use it. The device is technically compatible with both of T-Mobile's networks, but it's missing three of the carrier's bands.

Feb 26, 2020 Will my iPhone 6/6 Plus work with another carrier The AT&T iPhone 6 will work on Sprint and Verizon, but it's incompatible with their 3G networks. That means in the absence of a LTE signal your phone won't have a network to fall back to, and you won't be able to use it. The device is technically compatible with both of T-Mobile's networks, but it's missing three of the carrier's bands. How to stop iphone from using all my band… - Apple Community Jun 25, 2016

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How to Check Your Bandwidth Usage on iPhone or iPad: 6 Steps Feb 26, 2018 ‎Bandwidth on the App Store

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