grammar.verbs.volver-a
Volver a + infinitive: doing it again
Volví a llamar = 'I called again'. Spanish prefers volver a over otra vez for repetition: no vuelvas a hacerlo.
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Explicación
Conjugated volver + a + infinitive marks repetition: volvió a ganar ('he won again'), vuelvo a empezar ('I start over').
It conjugates in any tense and stacks naturally in warnings and promises: no lo volveré a hacer. Plain volver (no a + infinitive) just means to return.
Volver a + infinitive is the idiomatic way to say 'to do something again', usually preferred over otra vez or de nuevo attached to the verb: volví a leerlo sounds more natural than lo leí otra vez. Don't confuse it with plain volver ('to return') or with volverse ('to turn around', 'to become').
Ejemplos
I reread your message.
Región: global
The error showed up again.
Región: global
The call dropped, so I dialed again; he promised not to be late again.
Región: global