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Questions & Answers about Desculpa, enganei-me no número.
Why is it enganei-me instead of just enganei?
Why do we use the preposition no before número?
When you specify what you made a mistake about using the verb enganar-se, it requires the preposition em. Since número is a masculine noun, em combines with the definite article o to form no.
Is Desculpa formal or informal in this sentence?
It is informal. Desculpa is the imperative form used for tu. If you were speaking to someone formally, you would use the você form and say Desculpe, enganei-me no número.