In the above classification not indefinite but generic. If it was indefinite there would be an indefinite article. I know it is a slight difference but meaningful for a learner who is making choices.
Actually your examples also confirm it: if we talk about ´his mobile phone´ the accusative marking of a definite object is inevidable - no generic interpretation any more.
Sol eliyle cep telefonunu tutuyor.
Sometimes we don´t need to put an indefinite article "bir".
Sol eliyle cep telefonu tutuyor. ---> Here, we can consider that there is "bir" before "cep telefonu". In practice , we sometimes don´t put indefinite article when we refer an indefinite object.
Bir cep telefonu almam lazım --> I need to buy a mobile phone.
Cep telefonu almam lazım --> I need to buy a mobile phone.
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Cep telefonunu sakla ---> Can mean;
Hide your mobile phone
Hide his/her mobile phone ---> [onun] cep telefonunu sakla
Hide the mobile phone
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