Dial the person's phone number. When the phone is answered, start talking.
A person who does not speak is called mute or nonverbal.
mute
quiet
You call them 'mute'.
A person who can speak two languages is called a bilingual.
If you want to call her do it when you feel comfortable but it is always best to speak in person.
If someone is unable to speak, it's called being 'dumb'.
Hysterical.
no you dont
A "polyglot" is someone who knows several languages.
monolingual or unilingual
I think a tri-lingual person.