What is grammatically correct is "I called, but he didn't pick up his phone".
What is grammar in English language?
English grammar can be explained as the set of structural rules that is needed to be followed in English so as to be able to construct a correct statement.
These rules applied to different aspect of English such as :
- structure of words
- phrases
- clauses
- sentences
Therefore, the correct statement is I called, but he didn't pick up his phone".
Learn more about grammar at: https://brainly.com/question/2353198
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