A man has been jailed for two years and eight months after admitting falsely imprisoning and threatening to kill his wife, police said.
Christopher Jansons, 62, was arrested by officers as he stood over his wife on the floor of their bedroom in Bridgwater, Somerset.
Avon and Somerset Police said Jansons had secretly recorded her discussing their relationship with a friend on the evening of May 26.
He took his wife's phone from her and kept her from leaving the bedroom, the force said.
The woman had secretly managed to call police on another phone and was able to tell the call handler what was happening, as well as her address.
She then hid the phone and left the line open, with the handler remaining on the phone until police arrived at the scene.
Body-worn video shown to Taunton Crown Court shows the moment Jansons was arrested in the bedroom.
Detective Constable Mark Humphrey said: "Christopher Jansons could not accept his marriage had broken down and took his anger out on his wife.
"In that moment she was terrified of the man she had spent the majority of her life with and I shudder to think what could have happened if she wasn't able to call us on a hidden phone.
"There are no excuses for domestic abuse and I'd urge anyone who is subjected to it, whether it be physical or emotional abuse, to speak to someone.
"If you contact us we will take any report seriously and investigate any offences with the utmost care and sensitivity. You are not alone - we will there for you every step of the way."