Let's get back to the OP, whee SPB threw his cell phone across the room.

SPB, you did that because you were feeling one of the worst emotions - helpless rage. I'm glad it was a phone and not a pet or a baby.

You were trying to meet two conflicting demands. I call it being twisted. Your partner screwed up the reservation and wanted to be rescued right away. Ryanair is a budget company and wanted you to wait for normal business hours before it would help you. Fury set in, and the poor phone played the price.

Practice thinking some thoughts to defuse helpless rage, such as

I can't do everything.
This was YOUR screw-up.
It's only money.
Ryanair is probably spending most of its cash on safe planes.
It will probably be fine tomorrow.
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I' pretty sure that somebody capable of making an airline reservation which goes the wrong way entirely needs help. Set some rules.

"Don's try it on a phone."
"Have a friend look it over."