(Also) for this reason I have a 5 years old smartphone with 4G, a cheap operator and a small screen (that is an important point for UX testing).
The others reasons are that 1) a slightly slower connection create a beneficial friction reducing the use of the phone and 2) only old phones are small enough to fit in your pocket 3) It's crazy to throw so much money at something that breaks when dropped, when it should be treated as an everyday tool without excessive concern.
The others reasons are that 1) a slightly slower connection create a beneficial friction reducing the use of the phone and 2) only old phones are small enough to fit in your pocket 3) It's crazy to throw so much money at something that breaks when dropped, when it should be treated as an everyday tool without excessive concern.