I was thinking of a strictly ship board system, not personal phones, calls or text. Just be a distraction.
As far as not holding up, how much are UHF radios? $400 a pop? They get beat up bad, especially the engine guys, they are basically a consumable.
Text messages are easy to find, they are on my phone, not on a slip of paper in the pocket of the engineer in heap of dirty clothes in his room. Also they leave a good record with time sent, unlike phones and UHF.