I'm calling back or I'll call back may be English equivalents of 'Io richiamo'. The subject pronoun 'io' means 'I'. It doesn't have to be used, because the verb identifies the subject as the first person singular. The verb 'richiamo' means '[I] am calling, call, do call'.
Io in Italian means "I" in English.
"Am" in English means (Io) sono in Italian.
"I am not Italian!" in English is Io non sono italiano!in Italian.
Io sono di Catania in Italian means "I am from Catania" in English.
Io sono un amante in Italian means "I am a lover" in English.
Io odio la gente! in Italian is "I hate people!" in English.
Io sto ancora apprendendo in Italian is "I am still learning" in English.
Per il momento, io..." in Italian means "For the moment, I.." in English.
"I dance" in English is Io ballo in Italian.
"This is me" is an English equivalent of the Italian phrase Sono io.Specifically, the verb sono means "(I) am" in this context. The pronoun io means "I." The pronunciation is "SOH-noh EE-oh."
"Do you like me?" in English is Io ti piaccio? in Italian.
"I am stupid" in English is Io sono pazzo! in Italian.