A text message to someone who has a Boost Mobile cell phone doesn’t have to originate from another phone. You can also send a text message using your email account through your computer. It's free for you, even though the Boost Mobile customer may incur a charge depending upon his text-messaging plan.
Log into your email account. Click on the icon to compose a new email.
Type the person’s 10-digit Boost Mobile cell phone number along with Boost Mobile’s email address formatted correctly (firstname.lastname@example.org).
Enter the message into the body of the email. Click “Send Email.” The email will arrive as a text message on the person’s Boost Mobile phone in a few moments.