Yo (escribir/hablar) por teléfono con mi abuela cada sábado.

It's hablar.

Explanation:

Escribir means write in Spanish, while hablar means talk.

So:

" I talked over the phone with my grandmother on Saturday."

ancient india is often called the harappan civilization because one of the ancient cities was called harappa. harappa was just one of 1500 cities in the indus river valley. another well-known city is called mohenjo-daro. historians estimate ancient india to be the biggest of all four early civilizations.