breaking into

[unpakwon]

What does the following in red mean?

Woz and Jobs were heading back to Job's house... when the little red Fiat broke down. Locating a pay phone, they asked an operator to dial an 800 number, intending to use the blue box to call for assistance. But the phone company operator sniffed trouble and kept breaking into the call. Just as they were putting real money in the pay phone to make a legal call, a police car pulled up.

Thank you.

[5jj]

Defintion #5 should help: break into - definition. American English definition of break into by Macmillan Dictionary

[unpakwon]

Thank you for the help.