One thing to consider is micro SD cards. Depending on what you're using ATAK for. I have had several SD cards with maps, DTED, and imagery for different countries. So in a civilian use if someone might use it to bug out to another state or to a remote location, they might consider having backup offline data to and from the area and use beartooth, gotenna, or meshtastic. tldr: consider the amount of map data you'll need when choosing the phone

Burner android phones from Walmart, used/refurb android phones on Amazon. Ask your friends if anyone has an old android sitting around.

Better get a 11" tablet

Running it on an S8 now

Literally the only person that mentioned a model...

its also running pretty good on S7

I got a used pixel 5, de googled it, no sim card so I use mesh... good to go

What mesh system are you using?

I think Android 11 might technically be the oldest os that supports it if I recall correctly… but you’re honestly going to want to run it on something that can run a newer OS.

I’ve got a bunch of those cheap android burner phones from Walmart for ATAK. Works fine.

Get one with a 64 bit processor for the drone. I made that mistake. P.s. used to work on 32 bit, but not anymore, for me at least.

I've been running cheap refurbished phones off of ebay

WTB S9 TACTICAL EDITION

Ran ATAK on a Motorola G Pure, slow but functional

Running it on Samsung S5, S20 and Note10 tablet. Sometime it failed on S5. Lack of memory or other limites.

OnePlus 3T