IPhone 6
group of smartphone models produced by Apple Inc.
The iPhone 6 (GSM/North America/A1549) is a smartphone model produced by Apple Inc. that was first released on September 19, 2014, and officially discontinued on September 7, 2016, though a 32 GB variant was re-introduced on AT&T GoPhone in March 2017 and discontinued again on September 12, 2018. It features a 4.7-inch Retina HD display with a 1334x750 resolution, powered by the Apple A8 chip, 1 GB of RAM, and available in 16 GB, 32 GB, 64 GB, or 128 GB storage options. The device supports GSM, UMTS/HSPA+, and LTE networks, including bands 1, 2, 3, 4, 5, 7, 8, 13, 17, 18, 19, 20, 25, 26, 28, and 29, and is compatible with AT&T, T-Mobile, Bell, Rogers, Telus, and Telcel in North America. It includes an 8 MP rear iSight camera with autofocus, True Tone flash, and support for 1080p video recording at 30 or 60 fps, as well as a 1.2 MP front FaceTime camera for 720p video.
Differences between iPhone 6 Models (A1549, A1586, A1522 and A1524)
cellular carriers - Is the iPhone 6 model A1549 (CDMA) compatible with T-Mobile? - Ask Different
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749 in the US, respectively. Swiftkeyboard, HealthKit app, Swipe the phone as Debit/Credit card are the advanced feature in those gadgets. You may refer the following link for more detail on Apple's iPhone 6 and iPhone 6 plus devices. The GSM side of Verizon phones are unlocked and will work on domestic carriers but there is no guarantee all features will work. It is not the same for Sprint, the GSM side of that phone is unlocked and unlocking it will only allow it to work with non-domestic GSM carriers.
A1549 (CDMA):
This is considered as the world phone version. It supports all the same spectrum frequencies as the A1549 (GSM) and also includes CDMA EV-DO Rev. A and Rev. B (with 800, 1700/2100, 1900 and 2100 MHz bands). Besides, it works on UMTS/HSPA+/DC-HSDPA (850, 900, 1700/2100, 1900, 2100 MHz), GSM/EDGE (850, 900, 1800, 1900 MHz) and 4G LTE bands include bands 1, 2, 3, 4, 5, 7, 8, 13, 17, 18, 19, 20, 25, 26, 28, 29. The model is compatible with Verizon and Cricket in the US. However, if you buy an unlocked Verizon phone, you will be able to use it on any other GSM networks like T-Mobile and AT&T as well.
Best is to double check with T-Mobile.
Apple published detailed pages about both iPad LTE Support and iPhone LTE Support. These pages have a breakdown on device model versus carrier coverage for current (iPhone 6 and 6 Plus, iPad Air 2 and iPad Mini 3) and old devices.
From this table you can see carrier support per device number.
Group 1 (USA):
iPhone 6 Model A1549 (GSM) and Model A1549 (CDMA)
iPhone 6 Plus Model A1522 (GSM) and Model A1522 (CDMA)
Aio, Alaska Communications, AT&T, Consumer Cellular, Cricket, Family Mobile, GCI, Net 10, Straight Talk, T-Mobile, Union Wireless, Verizon
Group 2 (USA):
iPhone 6 Model A1586 (GSM) and Model A1586 (CDMA)
iPhone 6 Plus Model A1524 (GSM) and Model A1524 (CDMA)
Appalachian Wireless, Bluegrass Cellular, C Spire, Cellcom, Chariton Valley, Chat Mobility, Defense Mobile, MobileNation, Nex-Tech, NorthwestCell, nTelos, Pioneer Cellular, Sprint, STRATA Networks, Syringa, Thumb Cellular, United Wireless, US Cellular
I find awkward that iPhone 6 on the second group has the same list of LTE bands as the iPad Air 2 listing, but the list of international carriers is shorter. This can be caused by either iPad LTE page being more up to date, or because this is actually dependent on carrier configuration and contracts with Apple.
This iphone has 95%. Battery health, still runs older versions of apps from 2022. This is now my back up phone.