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I was planning on buying a 16 Plus soon for my wife. Last I checked, T-Mobile didn't have stock for the 16 Plus anymore but Apple obviously still does. However, I wasn't sure if Apple immediately removes the 2yr old phones for sale from their site as soon as the new phones are announced - I never tried buying a (new) 2yr old device.

The primary reason I want the 16 Plus is because my wife is on a 13PM that has seen its better days. Really can't justify the new PM costs since she doesn't use any "Pro" features, she simply just likes the larger screen.
 
I’m still on a 13 PM. Depending on any deals they may have on existing 17’s, or the new 18’s I may jump. But if they’re too much I’ll just replace the battery and use it until it’s no longer supported or dies, whichever comes first.
 
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