Harry Potter part-time extras working on a prequel to the hit film series, titled “Fantastic Beasts and Where to Find Them”, are threatening to quit after having their cell phones confiscated.

The reason for the phone ban is the fear by Warner Bros chiefs that the extras will take and post pics of the cast that include Eddie Redmayen and Colin Farrell.

On their part, the extras claim that the on-set ban will cost them work because they have to accept job offers fast or miss out on job opportunities.