Variation between models in phone

[spiral]

Have a list of Android phones under consideration.

Must use it in a location that receives variable signal strength--sometimes it's on the low side. No wifi available.

Deal-breaker criteria is using an app that requires sending/receiving encrypted info from this location and avoiding time-outs. I can

 

[Crashdamage]

Other than checking reviews I don't know anywhere to find that info.

T-Mobile supplies free signal boosters for those in weak signal areas. I have one. Maybe Sprint will do the same.