In The Heart of the Buddha's Teaching, Thich Nhat Hanh offers a short verse, called a gatha, to reinforce the intention to cultivate right speech. Try repeating this as you pick up your telephone:

"Words can travel thousands of miles.
May my words create mutual understanding and love.
May they be as beautiful as gems,
as lovely as flowers."

Thich Nhat Hanh, Frederic and Mary Ann Brussat in The Heart of the Buddha's Teaching by Frederic and Mary Ann Brussat